Automatic sewing method and equipment for bag opening of a flexible intermediate bulk container

Abstract

The application discloses a kind of automatic bag mouth sewing method and equipment of bag mouth of bag or ton bag, it is related to sewing equipment technical field, method includes: using multiple bag supporting columns to the bag mouth of bag or ton bag is pre-opened shaping, control spring bag supporting and taking bag mechanism enters bag and is externally stretched tightly bag body;After bag supporting column retreats, bag or ton bag is moved to hollow cylinder, and bag mouth is set on the outer periphery of the upper end of cylinder;Bag mouth is compressed and forms negative pressure in cylinder, so that bag body is attached to the inner wall of cylinder;Knitted reinforcing sheet is superimposed at bag mouth and is compressed by rotary air cylinder compression device, hollow cylinder is rotated, and sewing mechanism fixed on the outside of cylinder is completed circumferential closed loop sewing.By the technical scheme of the application, bag mouth pre-shaping, bag body self-adapting inner support, concentric transfer, circumferential compression and negative pressure attachment can be completed in sequence before sewing, reducing bag body wrinkle, bulge and reinforcing sheet deviation, improving the continuity, uniformity and processing efficiency of bag mouth circumferential sewing line.

Description

Technical Field

[0001] This invention relates to the field of sewing equipment technology, and in particular to an automatic sealing and sewing method for the opening of a bulk bag or ton bag, and an automatic sealing and sewing device for the opening of a bulk bag or ton bag. Background Technology

[0002] FIBCs (Flexible Intermediate Bulk Containers) and ton bags are typically made of flexible woven materials. Reinforcing sheets are required at the inlet or outlet, and these sheets are connected to the bag opening via circumferential sewing to improve the structural strength, tensile strength, and reliability of the opening area. Especially for larger FIBCs or ton bags with softer bodies, the bag opening must be sewn in a predetermined shape and position, and the reinforcing sheet must be stably overlapped with the opening throughout the entire circumference to obtain a continuous and uniform circular stitch.

[0003] In existing processing methods, operators typically place the FIBCs or ton bags onto supporting fixtures, manually adjust the bag opening, insert reinforcing sheets, and then sew them on. Because FIBCs or ton bags are flexible and large, the bag opening is prone to shrinkage, skewing, or localized wrinkles during opening, transport, and placement at the sewing station; the bag itself is also prone to loosening and bulging. Operators need to repeatedly flatten and adjust the bag opening, making it difficult for the center of the bag opening to stably align with the sewing station, and the reinforcing sheets are also prone to shifting or edge lifting during subsequent sewing.

[0004] Furthermore, some existing equipment only clamps a portion of the bag opening, making it difficult to maintain a flat and stable sewing condition for the entire bag. When the bag has wrinkles, bulges, or uneven clamping at the opening, problems such as thread trajectory deviation, uneven stitch spacing, misalignment of reinforcing sheets, and localized missed stitches can easily occur during rotary sewing, affecting the sewing quality and load-bearing reliability of the bag opening. Manual finishing, positioning, and auxiliary tightening also increase the workload, limiting the continuous and automated production efficiency of FIBC and ton bag opening sewing.

[0005] Therefore, it is necessary to provide an automatic circumferential sewing method for the opening of bulk bags or ton bags to solve the problems of difficulty in bag opening shaping and transfer positioning, easy wrinkling and bulging of bag body, easy displacement of reinforcing sheet and insufficient stability of circumferential sewing quality. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides an automatic circumferential sewing method and equipment for container bags or ton bags. Multiple support columns pre-open and shape the bag opening, while a spring-loaded bag-lifting mechanism with a retractable diameter and outward expansion provides adaptive support to the inner wall of the container bag or ton bag. This ensures the bag maintains a stable shape during the retraction and transfer of the support columns and allows for concentric fitting with a hollow cylinder, reducing the risk of bag opening skewing, shrinkage, and misalignment during transport. The outer circumference of the hollow cylinder presses against the bag opening, creating negative pressure within its cavity to ensure the bag fits snugly against the cylinder's inner wall, effectively eliminating bag looseness, wrinkles, and bulges. Furthermore, a rotating clamping mechanism presses the reinforcing sheet against the bag opening, driving the cylinder to rotate in conjunction with a fixed sewing mechanism to complete a closed-loop circumferential sewing. This prevents the reinforcing sheet from shifting or lifting, ensuring the continuity and uniformity of the circular seam, improving bag opening sewing quality, load-bearing reliability, and continuous production efficiency.

[0007] To achieve the above objectives, the present invention provides an automatic sealing and sewing method for the opening of a bulk bag or ton bag, comprising: The bag opening of the container bag or ton bag to be processed is fitted onto the outside of multiple bag support columns, and each of the bag support columns is driven to move outward to pre-open and shape the bag opening; The spring-supported bag-taking mechanism is controlled to enter the container bag or ton bag in the reduced diameter state, and the spring-supported bag-taking mechanism is switched to the outward expansion state to adaptively tighten the inner wall of the container bag or ton bag. After each of the supporting columns is moved away, the container bag or ton bag with the inner support is moved to the top of the hollow cylinder, so that the center of the bag opening corresponds to the axis of the hollow cylinder, and the bag opening is fitted onto the outer periphery of the upper end of the hollow cylinder. The cylinder bag pressing mechanism is controlled to press the bag opening and create a negative pressure in the inner cavity of the hollow cylinder so that the container bag or ton bag adheres to the inner wall of the hollow cylinder. The woven reinforcing sheet is stacked on the bag opening, and the rotary cylinder pressing device is controlled to move down and rotate to lock in place, so as to press the woven reinforcing sheet and the bag opening tightly. The hollow cylinder is driven to rotate by a rotary drive mechanism, and the woven reinforcing sheet and the bag opening are circumferentially closed-loop sewn by a sewing mechanism fixed to the outside of the hollow cylinder.

[0008] In the above technical solution, preferably, the plurality of bag-supporting columns include four bag-supporting columns distributed at the four corners of a rectangle. The four bag-supporting columns are driven by a slider telescopic cylinder to expand outward or retract synchronously, so as to evenly open the bag opening or to make the bag-supporting columns detach from the bag opening.

[0009] In the above technical solution, preferably, the spring-supported bag-retrieving mechanism includes a built-in telescopic cylinder and an annularly arranged elastic spring assembly; Before entering the container bag or ton bag, the built-in telescopic cylinder drives the elastic spring assembly to tighten and narrow its diameter; after entering the container bag or ton bag, the built-in telescopic cylinder drives the elastic spring assembly to open outward, so as to fit and support the inner wall of the container bag or ton bag.

[0010] In the above technical solution, preferably, moving the internally supported container bag or ton bag to directly above the hollow cylinder includes: After each of the bag-supporting columns retracts, the vertical lifting guide rail mechanism is controlled to raise the spring-loaded bag-removing mechanism, so that the container bag or ton bag is detached from the bag-supporting columns. The lateral translation mechanism is controlled to move the spring-supported bag-retrieving mechanism to directly above the hollow cylinder. The vertical lifting guide rail mechanism is controlled to descend, so that the bag opening is fitted onto the outer periphery of the upper end of the hollow cylinder.

[0011] In the above technical solution, preferably, the cylinder sleeve pressing mechanism includes the hollow cylinder, a plurality of clamping cylinders evenly arranged along the circumference of the hollow cylinder, and an arc-shaped pressing block corresponding to each clamping cylinder; Controlling the clamping components in the cylinder bag clamping mechanism to press the bag opening includes controlling each clamping cylinder to synchronously drive the corresponding arc-shaped pressure block to move towards the hollow cylinder to clamp the bag opening from the circumferential direction.

[0012] In the above technical solution, preferably, the negative pressure suction fan mechanism includes a high-pressure vortex negative pressure fan that communicates with the inner cavity of the hollow cylinder. The high-pressure vortex negative pressure fan is used to create negative pressure in the inner cavity of the hollow cylinder, so that the container bag or ton bag adheres to the inner wall of the hollow cylinder.

[0013] In the above technical solution, preferably, the rotary cylinder pressing device has vertical downward displacement and rotary swing pressing functions; Controlling the rotary cylinder pressing device to descend and rotate to lock in position includes controlling the rotary cylinder pressing device to descend to the pressing position and then rotate to the locking position to limit the relative displacement between the woven reinforcing sheet and the bag opening during the circumferential sewing process.

[0014] In the above technical solution, preferably, the rotary drive mechanism includes a servo motor, a gear transmission group and a rotating base, and the servo motor drives the hollow cylinder to rotate at a constant speed around its axis through the gear transmission group.

[0015] The present invention also proposes an automatic sealing and sewing device for container bags or ton bags, including a frame, a bag-feeding and supporting column mechanism, a spring-supported bag-taking mechanism, a vertical lifting guide rail mechanism, a horizontal translation mechanism, a cylinder bag-feeding and pressing mechanism, a negative pressure suction fan mechanism, a rotary cylinder pressing device, a rotary drive mechanism, and a sewing mechanism. The bag-feeding and bag-supporting column mechanism and the lateral translation mechanism are mounted on the frame. The bag-feeding and bag-supporting column mechanism is used to pre-open the bag opening of the container bag or ton bag. The spring-supported bag-taking mechanism is installed on the vertical lifting guide rail mechanism, and the vertical lifting guide rail mechanism is installed on the horizontal translation mechanism, so that the spring-supported bag-taking mechanism can enter the container bag or ton bag for internal support, and transfer the internally supported container bag or ton bag to the cylinder bag-pressing mechanism. The cylinder bag-sealing and pressing mechanism includes a hollow cylinder mounted on the frame and a clamping component mounted on the outer periphery of the upper end of the hollow cylinder for pressing the bag opening. The negative pressure suction fan mechanism is connected to the inner cavity of the hollow cylinder. The rotary cylinder clamping device is located above the hollow cylinder and has downward clamping and rotary locking functions; The rotary drive mechanism is located below the hollow cylinder and is connected to the hollow cylinder in a transmission manner to drive the hollow cylinder to rotate; The sewing mechanism is fixedly installed on the outside of the hollow cylinder to cooperate with the rotation of the hollow cylinder to complete the circumferential closed-loop sewing.

[0016] In the above technical solution, preferably, the bag-supporting column mechanism includes four supporting columns distributed in a rectangular shape at the four corners and a sliding telescopic cylinder for driving each of the supporting columns to expand outward or retract synchronously. The spring-supported bag-retrieving mechanism includes a built-in telescopic cylinder and a ring-shaped arrangement of elastic springs. The clamping components of the cylinder sleeve pressing mechanism include multiple sets of clamping cylinders and arc-shaped pressing blocks evenly arranged along the circumference of the hollow cylinder. The negative pressure suction fan mechanism includes a high-pressure vortex negative pressure fan; The rotary drive mechanism includes a servo motor, a gear transmission assembly, and a rotating base.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The bag opening is pre-opened by the support column, and the inner wall of the bag is self-adaptively supported by the retractable and outward-expanding spring support bag picking mechanism, so that the flexible container bag or ton bag can still be opened during the column retreat and transfer process; in conjunction with vertical lifting and horizontal translation, the bag opening can be stably transferred to the corresponding position of the hollow cylinder, reducing bag opening retraction, skew and transfer misalignment, and improving the reliability of subsequent ring positioning.

[0018] (2) The bag opening is pressed from the circumference by the cylinder bag pressing mechanism, and a negative pressure is formed in the hollow cylinder, so that the bag body fits against the inner wall of the cylinder. This can reduce the impact of bag body looseness, wrinkles and bulges on the sewing process, so that the bag opening maintains a relatively stable shape and position in the circumferential direction, providing a stable sewing foundation for obtaining continuous and uniform circular stitches.

[0019] (3) By using a rotary cylinder pressing device to press down and rotate the woven reinforcing sheet and the bag opening, the relative displacement or edge lifting of the reinforcing sheet and the bag opening can be limited during sewing. This structure enables the reinforcing sheet to maintain a stable overlapping relationship with the bag opening, reducing the risk of reinforcing sheet misalignment, local missing seams and seam deviation, and improving the connection quality and load-bearing reliability of the bag opening reinforcement.

[0020] (4) The rotary drive mechanism drives the hollow cylinder to rotate at a constant speed around the axis, and works with the fixed sewing mechanism to complete the circumferential closed-loop sewing. There is no need for the operator to continuously manually adjust the sewing trajectory, which helps to maintain the sewing consistency of each position on the circumference and improves the continuity and processing efficiency of the bag opening sewing.

[0021] (5) By integrating the bag support, inner support bag removal, transfer and positioning, bag mouth pressing, negative pressure flattening, reinforcing sheet pressing, rotation and sewing mechanism into a collaborative working device, the various mechanisms work together in sequence around the bag mouth sewing process, which can reduce the need for manual sorting and repeated correction, and is suitable for continuous processing of container bags and ton bags. Attached Figure Description

[0022] Figure 1 This is a front perspective view of an automatic sealing and sewing device for the opening of a container bag or ton bag, as disclosed in an embodiment of the present invention. Figure 2 This is a three-dimensional structural diagram of the back of an automatic sealing and sewing device for the opening of a container bag or ton bag, as disclosed in an embodiment of the present invention. Figure 3 This is a front view structural schematic diagram of an automatic sealing and sewing device for the opening of a container bag or ton bag, as disclosed in an embodiment of the present invention. Figure 4 This is a side view of an automatic sealing and sewing device for the opening of a container bag or ton bag, as disclosed in an embodiment of the present invention. Figure 5 This is a top view of an automatic sealing and sewing device for the opening of a container bag or ton bag, as disclosed in an embodiment of the present invention. Figure 6 This is a schematic diagram of the structure of a bag-supporting column mechanism disclosed in one embodiment of the present invention; Figure 7This is a schematic diagram of the structure of a spring-supported bag-retrieving mechanism disclosed in one embodiment of the present invention; Figure 8 This is a schematic diagram of the cylinder sleeve pressing mechanism disclosed in one embodiment of the present invention.

[0023] In the diagram, the correspondence between the components and the reference numerals is as follows: 1. Frame; 2. Bag-feeding and supporting column mechanism; 21. Supporting column; 22. Sliding telescopic cylinder; 3. Spring-supported bag-removing mechanism; 31. Built-in telescopic cylinder; 32. Elastic spring assembly; 4. Transfer mechanism; 41. Lateral translation mechanism; 42. Vertical lifting guide rail mechanism; 5. Cylinder bag-feeding and pressing mechanism; 51. Hollow cylinder; 52. Clamping cylinder; 53. Arc-shaped pressing block; 6. Negative pressure suction fan mechanism; 7. Rotary cylinder pressing device; 8. Rotary drive mechanism; 81. Servo motor; 82. Gear transmission group; 83. Rotary base; 9. Sewing mechanism. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings: like Figures 1 to 8 As shown, an automatic sealing and sewing method for the opening of a container bag or ton bag according to the present invention includes: First, the opening of the container bag or ton bag to be processed is placed over the outside of multiple bag-supporting columns 21. This initial bag-fitting operation can be performed by the operator, ensuring that the bag opening roughly covers each bag-supporting column 21. After the equipment is started, each bag-supporting column 21 moves outward, pre-opening and shaping the bag opening, so that the soft and easily collapsed bag opening forms a more stable unfolded profile, and improving the uneven tightness, skewing, and wrinkling of the bag opening.

[0026] After pre-supporting the bag opening, the spring-loaded bag-lifting mechanism 3 is controlled to enter the container bag or ton bag in its reduced-diameter state. In the reduced-diameter state, the lateral dimension of the spring-loaded bag-lifting mechanism 3 is smaller, which reduces the risk of it scraping or interfering with the edge of the bag opening when entering the bag body. After the spring-loaded bag-lifting mechanism 3 is in place, it is switched to the outward-opening state, which tightens the inner wall of the container bag or ton bag from the inside out. Because the spring-loaded bag-lifting mechanism 3 can provide adaptive internal support to the bag body, the bag body can remain in an open state even after the supporting column 21 retracts, thus forming a dual positioning relationship of external pre-support shaping and internal adaptive support.

[0027] After the support columns 21 are retracted, the container bag or ton bag supported by the inner supports is moved to the top of the hollow cylinder 51. During the transfer, the spring-supported bag-taking mechanism 3 continues to support the bag body, making it difficult for the bag opening to shrink or collapse. After reaching the top of the hollow cylinder 51, the center of the bag opening is aligned with the axis of the hollow cylinder 51, and then the bag opening is fitted onto the outer circumference of the upper end of the hollow cylinder 51. Through the above alignment and fitting process, the possibility of the bag opening being skewed, twisted, or partially folded relative to the hollow cylinder 51 can be reduced, establishing a more stable positioning reference for subsequent circumferential sewing.

[0028] After the bag opening is properly fitted, the control cylinder bag clamping mechanism 5 presses the bag opening, keeping it fixed relative to the hollow cylinder 51. Subsequently, a negative pressure is created inside the hollow cylinder 51, using the pressure difference to draw the container bag or ton bag against the inner wall of the cylinder 51, causing the bag to adhere to the cylinder wall from the opening downwards. This reduces bag looseness, wrinkles, and bulging, and prevents localized accumulation or irregular swaying of the bag during the rotation of the hollow cylinder 51.

[0029] After the bag opening is tightened and the bag body is flattened under negative pressure, the woven reinforcing sheet is stacked on top of the bag opening. In one specific embodiment, the woven reinforcing sheet can be a square sheet with a size of approximately 1m × 1m; this size is only a specific example given in the manual and can be adapted to the bag opening size and reinforcement range. The woven reinforcing sheet can be laid flat above the bag opening by the operator to cover the predetermined bag opening reinforcement area.

[0030] The rotary cylinder pressing device 7 is controlled to descend and rotate to clamp, pressing the woven reinforcing sheet and the bag opening together. The descending process is used to make the woven reinforcing sheet fit the bag opening, and the rotation clamping is used to form a locking state to limit the relative displacement between the woven reinforcing sheet and the bag opening during subsequent rotation, reducing sheet offset, edge lifting or partial detachment.

[0031] After pressing, the hollow cylinder 51 is driven to rotate by the rotary drive mechanism 8. Because the bag opening is pressed against the hollow cylinder 51, the bag body is suctioned to the inner wall of the hollow cylinder 51 by negative pressure, and the woven reinforcing sheet is locked by the rotary cylinder pressing device 7, the hollow cylinder 51, the bag body, and the woven reinforcing sheet can form a relatively stable synchronous rotational relationship. The sewing mechanism 9, fixedly installed on the outside of the hollow cylinder 51, continuously sews the woven reinforcing sheet and the bag opening, forming a 360° closed-loop stitch after the hollow cylinder 51 rotates one revolution.

[0032] In a complete processing cycle, after the circumferential sewing is completed, the negative pressure in the hollow cylinder 51 can be released, the bag opening can be loosened, the locking state of the rotary cylinder clamping device 7 can be released, and the bag support column 21, the spring bag support and bag taking mechanism 3, the transfer mechanism 4 and the rotary drive mechanism 8 can be restored to their initial state to wait for the processing of the next container bag or ton bag.

[0033] In this embodiment, the continuous coordination of bag opening pre-support, bag body support, bag transfer, bag opening pressing, whole bag negative pressure flattening, reinforcing sheet locking, and rotary sewing can solve the problems of bag opening skew, bag body wrinkles, sheet misalignment, and uneven stitches in manual loop sewing, thereby improving the continuity of bag opening reinforcement sewing, finished product consistency, and processing efficiency.

[0034] In the above embodiment, preferably, the plurality of bag-supporting columns 21 are specifically four, and the four bag-supporting columns 21 are respectively located at the four corners of the rectangle. During the initial bagging, the bag opening is placed on the outside of the four bag-supporting columns 21; after the slider telescopic cylinder 22 is activated, it drives the four bag-supporting columns 21 to expand outward synchronously, so that the bag opening obtains a relatively balanced opening force in four directions.

[0035] The rectangular four-corner distribution is compatible with the common square or near-square initial shape of the opening of FIBCs and ton bags. When the four supporting columns 21 expand outwards simultaneously, the bag opening can be gradually unfolded and pre-tensioned from a relaxed state, reducing the twisting of the bag opening and localized stress concentration caused by unilateral expansion.

[0036] After the spring-supported bag-retrieving mechanism 3 completes its internal support, the slider telescopic cylinder 22 drives the four supporting columns 21 to retract synchronously, causing the supporting columns 21 to detach from the bag opening and retract inward. After the supporting columns 21 retract, interference with the internally supported bag body is avoided, and space is provided for subsequent lifting and transfer of the bag body.

[0037] In this embodiment, the rectangular distribution and synchronous movement of the four bag-supporting columns 21 at the four corners enable the bag opening to achieve a more uniform pre-opening effect. At the same time, the synchronous closing enables rapid removal of the columns, which helps to improve the initial shaping quality of the bag opening and the connection efficiency between the bag-supporting process and the transfer process.

[0038] In the above embodiments, preferably, the spring-supported bag-retrieving mechanism 3 includes a built-in telescopic cylinder 31 and an elastic spring assembly 32 arranged in a circumferential ring.

[0039] Before the spring-supported bag-retrieving mechanism 3 enters the container bag or ton bag, the built-in telescopic cylinder 31 drives the elastic spring assembly 32 to tighten and reduce the outer diameter, thereby reducing the outer diameter of the spring-supported bag-retrieving mechanism 3. As a result, the spring-supported bag-retrieving mechanism 3 can pass through the pre-opened bag opening more smoothly and enter the bag body, reducing the possibility of pulling the bag opening or scratching the bag body during the entry process.

[0040] Once the spring-supported bag-retrieving mechanism 3 enters the predetermined position inside the bag, the built-in telescopic cylinder 31 drives the elastic spring assembly 32 to open outward. The annularly arranged elastic spring assembly 32 contacts the inner wall along the circumference of the bag and generates corresponding elastic deformation according to the tightness of different positions of the bag, thereby forming an adaptive internal support.

[0041] In this embodiment, compared to a rigid bag support with a fixed diameter, the annular elastic spring assembly 32 can adapt to the differences in thickness, flexibility and inner diameter of ordinary bulk bags or ton bags, thickened bulk bags or ton bags, bulk bags and ton bags, so that the bag body can obtain more uniform internal support and reduce the risk of local damage caused by rigid compression. It also helps to keep the bag body in an unfolded state during the retraction and transfer of the column.

[0042] In the above embodiments, preferably, transferring the internally supported container bag or ton bag to directly above the hollow cylinder 51 includes: After the bag support column 21 retracts, the vertical lifting guide rail mechanism 42 is first controlled to raise the spring-loaded bag lifting mechanism 3. While maintaining the outward expansion and inward support state, the spring-loaded bag lifting mechanism 3 drives the entire container bag or ton bag to rise, so that the bag body and bag opening are completely separated from the area where the bag support column 21 is located, avoiding collision or snagging with the bag support column 21 during subsequent lateral movement.

[0043] Subsequently, the control lateral translation mechanism 41 drives the spring-supported bag-picking mechanism 3 and the container bag or ton bag to move towards the hollow cylinder 51 until the center of the bag opening corresponds to the axis of the hollow cylinder 51. Since the bag body is always supported internally during the movement, the bag opening can maintain a relatively stable unfolded profile, which is beneficial to improving the alignment accuracy.

[0044] After completing the horizontal alignment, the vertical lifting guide rail mechanism 42 is controlled to descend, so that the bag opening is fitted onto the outer periphery of the upper end of the hollow cylinder 51 from top to bottom.

[0045] In this embodiment, by first raising the detachment column, then moving it laterally, and finally lowering the sleeve, stable transfer and concentric alignment in the bagged state can be achieved, reducing skewing, folding, and misalignment during the bag opening sleeve process.

[0046] In the above embodiment, preferably, the cylinder-type bag clamping mechanism 5 includes a hollow cylinder 51, multiple sets of clamping cylinders 52, and arc-shaped pressure blocks 53 corresponding to each clamping cylinder 52. The multiple sets of clamping cylinders 52 are evenly arranged around the hollow cylinder 51, so that the clamping positions are distributed in different areas around the bag opening.

[0047] After the bag opening is fitted onto the outer circumference of the upper end of the hollow cylinder 51, each clamping cylinder 52 operates synchronously, driving the corresponding arc-shaped pressure block 53 to move towards the hollow cylinder 51. The arc-shaped pressure block 53 presses the bag opening against the outer wall of the hollow cylinder 51 from the outside, so that the bag opening is simultaneously compressed at multiple positions around the circumference.

[0048] Because the shape of the arc-shaped pressure block 53 is adapted to the outer circumference of the hollow cylinder 51, the effective clamping range of the bag opening can be increased, and the bag opening can be kept in a relatively flat and circumferentially fixed state. The synchronous driving of each clamping cylinder 52 can also reduce the displacement or local loosening caused by uneven force on the bag opening.

[0049] In this embodiment, a reliable mechanical positioning of the bag opening can be established before the negative pressure suction bag and rotary sewing, so that the bag opening is less likely to slip or misalign during the formation of negative pressure in the hollow cylinder 51 and during rotation, providing a stable foundation for circumferential closed-loop sewing.

[0050] In the above embodiments, preferably, the negative pressure suction fan mechanism 6 includes a high-pressure vortex negative pressure fan, which is connected to the inner cavity of the hollow cylinder 51.

[0051] After the bag opening is compressed, the high-pressure vortex negative pressure fan is started to create a stable negative pressure inside the hollow cylinder 51. Under the action of negative pressure, the container bag or ton bag is sucked into the hollow cylinder 51 from the bag opening and adheres to the inner wall of the hollow cylinder 51, causing the originally soft and loose bag body to unfold along the cylinder wall.

[0052] By using the inner cavity of the hollow cylinder 51 to apply negative pressure to the entire bag body, wrinkles, bulges and material accumulation can be reduced near the sewing position, and the bag body can be prevented from swinging irregularly when the hollow cylinder 51 rotates.

[0053] In this embodiment, the stability of the bag's rotation state can be improved, and the interference of wrinkles on the pressing of the reinforcing sheet and the circumferential seam trajectory can be reduced.

[0054] In the above embodiments, preferably, the rotary cylinder pressing device 7 has vertical downward displacement and rotary swing pressing functions; After the woven reinforcing sheet is laid flat at the bag opening, the rotary cylinder pressing device 7 is controlled to move vertically downwards, so that it reaches the pressing position above the woven reinforcing sheet and presses the woven reinforcing sheet towards the bag opening, so that the two form a stable laminated structure.

[0055] After the rotary cylinder clamping device 7 descends to its designated position, it is then controlled to rotate and swing to the locking position, thereby creating a rotational lock on the woven reinforcing sheet and the bag opening. Compared with simple vertical pressing, the combined action of descending and rotating locking can restrict the movement of the woven reinforcing sheet in both the circumferential and vertical directions.

[0056] In this embodiment, when the hollow cylinder 51 drives the bag body to rotate, the rotary cylinder pressing device 7 remains in a locked and pressed state, which can reduce the offset, displacement or edge lifting of the woven reinforcing sheet relative to the bag opening, avoid local missing seams or the reinforcing sheet coming loose, and improve the sewing integrity of the bag opening reinforcing structure.

[0057] In the above embodiment, preferably, the rotary drive mechanism 8 includes a servo motor 81, a gear transmission group 82, and a rotating base 83. The power output by the servo motor 81 is transmitted through the gear transmission group 82 to drive the hollow cylinder 51 to rotate at a constant speed around its own axis. The rotating base 83 is used to form the mounting and rotation bearing part of the rotary drive mechanism 8.

[0058] When the hollow cylinder 51 rotates, the bag opening rotates with the cylinder under the action of the cylinder sleeve pressing mechanism 5. The bag body adheres to the inner wall of the cylinder under negative pressure. The woven reinforcing sheet is held at the bag opening under the action of the rotating cylinder pressing device 7, so that the hollow cylinder 51, the bag body and the woven reinforcing sheet form a stable synchronous rotation relationship.

[0059] In this embodiment, the servo motor 81 provides relatively stable speed control, and the gear transmission group 82 can smoothly transmit power. Combined with the fixedly installed sewing mechanism 9, it allows each position around the bag opening to pass through the sewing position at a relatively uniform speed, thereby improving the uniformity of the stitch spacing and the regularity of the closed-loop stitch.

[0060] like Figures 1 to 8 As shown, the present invention also proposes an automatic sealing and sewing device for container bags or ton bags, including a frame 1, a bag-feeding and supporting column mechanism 2, a spring-supported bag-taking mechanism 3, a vertical lifting guide rail mechanism 42, a horizontal translation mechanism 41, a cylinder bag-feeding and pressing mechanism 5, a negative pressure suction fan mechanism 6, a rotary cylinder pressing device 7, a rotary drive mechanism 8, and a sewing mechanism 9.

[0061] The bag-supporting column mechanism 2 is used to pre-open the mouth of the container bag or ton bag, so that the bag mouth is in an unfolded state that facilitates the entry of the spring-supported bag-retrieving mechanism 3. The spring-supported bag-retrieving mechanism 3 is installed on the vertical lifting guide rail mechanism 42, which is installed on the horizontal translation mechanism 41, thereby forming a bag-carrying transfer structure capable of vertical lifting and horizontal translation.

[0062] During equipment operation, the spring-supported bag-retrieving mechanism 3 enters the interior of the container bag or ton bag and provides internal support for the bag body; the vertical lifting guide rail mechanism 42 drives the internally supported container bag or ton bag to detach from the bag-supporting column mechanism 2; the lateral translation mechanism 41 transfers the container bag or ton bag to the cylinder bag-pressing mechanism 5. The above mechanisms form a continuous cooperative relationship from bag opening pre-support, bag body support to bag transfer.

[0063] The cylinder-type bag-sealing and pressing mechanism 5 includes a hollow cylinder 51 mounted on the frame 1 and a clamping component located on the outer periphery of the upper end of the hollow cylinder 51. After the bag opening is fitted onto the hollow cylinder 51, it is pressed and fixed by the clamping component. The negative pressure suction fan mechanism 6 communicates with the inner cavity of the hollow cylinder 51 and is used to make the bag fit against the inner wall of the hollow cylinder 51 to improve the bag's looseness, wrinkles, and bulges.

[0064] The rotary cylinder clamping device 7 is located above the hollow cylinder 51, capable of downward clamping and rotating to secure the reinforcing sheet superimposed on the bag opening. The rotary drive mechanism 8 is located below the hollow cylinder 51 and is connected to it via a transmission mechanism. The sewing mechanism 9 is fixedly mounted on the outside of the hollow cylinder 51, completing the circumferential closed-loop sewing of the bag opening and the reinforcing sheet as the hollow cylinder 51 rotates.

[0065] In this embodiment, the equipment sequentially forms a bag opening pre-support area, a bag body transfer and alignment area, and a cylinder rotation and sewing area. It integrates bag support, internal support, alignment, pressing, flattening, locking, rotation, and sewing into the same equipment, reducing the need for continuous manual handling and hand-held bag body operation, and improving the automation level of bag opening sewing and the consistency of finished products.

[0066] In the above embodiment, preferably, the bag-supporting column mechanism 2 includes four bag-supporting columns 21 arranged in a rectangular shape at the four corners and a slider telescopic cylinder 22. The slider telescopic cylinder 22 drives the four bag-supporting columns 21 to expand outward or retract simultaneously, so as to achieve uniform pre-opening of the bag opening and retraction of the columns, respectively. This structure enables the bag opening to obtain a more regular initial shape and provides conditions for subsequent internal support and transfer.

[0067] The spring-supported bag-retrieving mechanism 3 includes a built-in telescopic cylinder 31 and elastic spring assemblies 32 arranged in a circumferential ring. The built-in telescopic cylinder 31 controls the elastic spring assembly 32 to tighten or expand outward, allowing the spring-supported bag-retrieving mechanism 3 to smoothly enter the bag and provide elastic internal support according to the shape of the inner wall of the bag. This structure can adapt to FIBCs or ton bags of different thicknesses and tightness.

[0068] The clamping components of the cylinder-type bag-sealing clamping mechanism 5 include multiple sets of clamping cylinders 52 and arc-shaped pressure blocks 53 evenly arranged around the circumference of the hollow cylinder 51. Each clamping cylinder 52 drives the corresponding arc-shaped pressure block 53 to press the bag opening, fixing the bag opening at multiple positions around the circumference. The negative pressure suction fan mechanism 6 includes a high-pressure vortex negative pressure fan, which generates negative pressure through the inner cavity of the hollow cylinder 51, causing the entire bag body to adhere to the cylinder wall.

[0069] The rotary drive mechanism 8 includes a servo motor 81, a gear transmission group 82, and a rotating base 83. The servo motor 81 drives the hollow cylinder 51 to rotate stably via the gear transmission group 82, and the fixed sewing mechanism 9 cooperates with the rotation of the cylinder to form a 360° closed-loop circumferential stitch.

[0070] In a specific processing cycle, initially, the bag support column 21 is in a retracted state, the spring-loaded bag-taking mechanism 3 is in a reduced-diameter state, the clamping components are in a released state, the negative pressure suction fan mechanism 6 is off, the rotary cylinder pressing device 7 is in a raised state, and the rotary drive mechanism 8 and sewing mechanism 9 are in a standby state. After sewing is completed, all mechanisms return to the above initial states, and the equipment enters the next processing cycle.

[0071] In this embodiment, through the combination of the above-mentioned specific structures, it is possible to achieve uniform pre-support of the bag opening, flexible internal support of the bag body, circumferential clamping of the bag opening, negative pressure flattening of the entire bag, locking of the reinforcing sheet, and stable rotation of the cylinder. It is suitable for bag opening reinforcement sewing processing of ordinary bulk bags or ton bags, thickened bulk bags or ton bags, bulk bags and large ton bags.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic sealing and sewing method for the opening of a bulk bag or ton bag, characterized in that, include: The bag opening of the container bag or ton bag to be processed is fitted onto the outside of multiple bag support columns, and each of the bag support columns is driven to move outward to pre-open and shape the bag opening; The spring-supported bag-taking mechanism is controlled to enter the container bag or ton bag in the reduced diameter state, and the spring-supported bag-taking mechanism is switched to the outward expansion state to adaptively tighten the inner wall of the container bag or ton bag. After each of the supporting columns is moved away, the container bag or ton bag with the inner support is moved to the top of the hollow cylinder, so that the center of the bag opening corresponds to the axis of the hollow cylinder, and the bag opening is fitted onto the outer periphery of the upper end of the hollow cylinder. The cylinder bag pressing mechanism is controlled to press the bag opening and create a negative pressure in the inner cavity of the hollow cylinder so that the container bag or ton bag adheres to the inner wall of the hollow cylinder. The woven reinforcing sheet is stacked on the bag opening, and the rotary cylinder pressing device is controlled to move down and rotate to lock in place, so as to press the woven reinforcing sheet and the bag opening tightly. The hollow cylinder is driven to rotate by a rotary drive mechanism, and the woven reinforcing sheet and the bag opening are circumferentially closed-loop sewn by a sewing mechanism fixed to the outside of the hollow cylinder.

2. The automatic loop sewing method according to claim 1, characterized in that, The plurality of bag-supporting columns include four bag-supporting columns distributed at the four corners of a rectangle. The four bag-supporting columns are driven by a slider telescopic cylinder to expand outward or retract in a synchronized manner, so as to evenly open the bag opening or to detach the bag-supporting columns from the bag opening.

3. The automatic loop sewing method according to claim 1, characterized in that, The spring-supported bag-retrieving mechanism includes a built-in telescopic cylinder and a ring-shaped arrangement of elastic springs. Before entering the container bag or ton bag, the built-in telescopic cylinder drives the elastic spring assembly to tighten and narrow its diameter; after entering the container bag or ton bag, the built-in telescopic cylinder drives the elastic spring assembly to open outward, so as to fit and support the inner wall of the container bag or ton bag.

4. The automatic loop sewing method according to claim 1, characterized in that, Moving the internally supported container bag or ton bag directly above the hollow cylinder includes: After each of the bag-supporting columns retracts, the vertical lifting guide rail mechanism is controlled to raise the spring-loaded bag-removing mechanism, so that the container bag or ton bag is detached from the bag-supporting columns. The lateral translation mechanism is controlled to move the spring-supported bag-retrieving mechanism to directly above the hollow cylinder. The vertical lifting guide rail mechanism is controlled to descend, so that the bag opening is fitted onto the outer periphery of the upper end of the hollow cylinder.

5. The automatic loop sewing method according to claim 1, characterized in that, The cylinder bag clamping mechanism includes the hollow cylinder, multiple sets of clamping cylinders evenly arranged along the circumference of the hollow cylinder, and arc-shaped pressure blocks corresponding to each clamping cylinder. Controlling the clamping components in the cylinder bag clamping mechanism to press the bag opening includes controlling each clamping cylinder to synchronously drive the corresponding arc-shaped pressure block to move towards the hollow cylinder to clamp the bag opening from the circumferential direction.

6. The automatic loop sewing method according to claim 1, characterized in that, The negative pressure suction fan mechanism includes a high-pressure vortex negative pressure fan that communicates with the inner cavity of the hollow cylinder. The high-pressure vortex negative pressure fan is used to create negative pressure in the inner cavity of the hollow cylinder, so that the container bag or ton bag adheres to the inner wall of the hollow cylinder.

7. The automatic loop sewing method according to claim 1, characterized in that, The rotary cylinder pressing device has vertical downward displacement and rotary swing pressing functions; Controlling the rotary cylinder pressing device to descend and rotate to lock in position includes controlling the rotary cylinder pressing device to descend to the pressing position and then rotate to the locking position to limit the relative displacement between the woven reinforcing sheet and the bag opening during the circumferential sewing process.

8. The automatic loop sewing method according to claim 1, characterized in that, The rotary drive mechanism includes a servo motor, a gear transmission group, and a rotating base. The servo motor drives the hollow cylinder to rotate at a constant speed around its axis through the gear transmission group.

9. An automatic sealing and sewing device for the mouth of a bulk bag or ton bag, characterized in that, It includes a frame, a bag-feeding and bag-supporting column mechanism, a spring-supported bag-taking mechanism, a vertical lifting guide rail mechanism, a horizontal translation mechanism, a cylinder bag-feeding and pressing mechanism, a negative pressure suction fan mechanism, a rotary cylinder pressing device, a rotary drive mechanism, and a sewing mechanism; The bag-feeding and bag-supporting column mechanism and the lateral translation mechanism are mounted on the frame. The bag-feeding and bag-supporting column mechanism is used to pre-open the bag opening of the container bag or ton bag. The spring-supported bag-taking mechanism is installed on the vertical lifting guide rail mechanism, and the vertical lifting guide rail mechanism is installed on the horizontal translation mechanism, so that the spring-supported bag-taking mechanism can enter the container bag or ton bag for internal support, and transfer the internally supported container bag or ton bag to the cylinder bag-pressing mechanism. The cylinder bag-sealing and pressing mechanism includes a hollow cylinder mounted on the frame and a clamping component mounted on the outer periphery of the upper end of the hollow cylinder for pressing the bag opening. The negative pressure suction fan mechanism is connected to the inner cavity of the hollow cylinder. The rotary cylinder clamping device is located above the hollow cylinder and has downward clamping and rotary locking functions; The rotary drive mechanism is located below the hollow cylinder and is connected to the hollow cylinder in a transmission manner to drive the hollow cylinder to rotate; The sewing mechanism is fixedly installed on the outside of the hollow cylinder to cooperate with the rotation of the hollow cylinder to complete the circumferential closed-loop sewing.

10. The automatic loop sewing machine according to claim 9, characterized in that, The bag-supporting column mechanism includes four rectangular support columns distributed at the four corners and a sliding telescopic cylinder for driving each of the support columns to expand outward or retract synchronously. The spring-supported bag-retrieving mechanism includes a built-in telescopic cylinder and a ring-shaped arrangement of elastic springs. The clamping components of the cylinder sleeve pressing mechanism include multiple sets of clamping cylinders and arc-shaped pressing blocks evenly arranged along the circumference of the hollow cylinder. The negative pressure suction fan mechanism includes a high-pressure vortex negative pressure fan; The rotary drive mechanism includes a servo motor, a gear transmission assembly, and a rotating base.

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