Ton bag sling high-precision automatic sewing device

Abstract

The invention relates to the technical field of ton bag sewing, and discloses a ton bag sling high-precision automatic sewing device which comprises a supporting base, a bottom plate is fixedly connected to one end of the top of the supporting base, a pressing block is fixedly connected to one end of the top of the bottom plate, and a sewing device is correspondingly connected to one side of the pressing block. The other end of the top of the bottom plate is correspondingly connected with a fixing device, the fixing device comprises a pushing device and grabbing and clamping devices, and when the pushing device drives the grabbing and clamping devices movably connected with the two ends of the pushing device to move, the two grabbing and clamping devices can rapidly get close to the center, so that grabbing of the two ends of a ton bag is achieved; the bottom of the pushing device is fixedly connected with a lifting device, the lifting device can be driven by electric power to horizontally move, and in the moving process, the lifting device can drive folding structures on the two sides to be unfolded upwards to achieve adjustment of different heights. Therefore, the use efficiency of the pushing device and the gripping device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bulk bag stitching, and specifically to a high-precision automatic stitching device for bulk bag slings. Background Art

[0002] In the field of bulk bag production, the stitching quality of slings plays a crucial role in the load-bearing capacity and service life of bulk bags. Currently, the stitching of bulk bag slings mostly relies on manual operation or relatively simple mechanical equipment. However, manual stitching has low efficiency, and affected by the proficiency of workers, it is difficult to guarantee the stitching precision and quality, and problems such as uneven stitching threads and uneven stitch distances are likely to occur, resulting in potential safety hazards during the use of bulk bags. For some existing automatic stitching equipment, there is a lack of effective auxiliary devices when fixing bulk bags, and the bag body is prone to displacement and wrinkles during the stitching process, making the flatness of the sling stitching area poor, which not only affects the appearance but also reduces the overall strength of the bulk bag. In addition, the height adjustment function of existing equipment is often not flexible enough to adapt to the stitching requirements of different specifications of bulk bags, greatly limiting the improvement of production efficiency and product quality. Based on this, the present invention proposes a high-precision automatic stitching device for bulk bag slings to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-precision automatic stitching device for bulk bag slings to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A high-precision automatic stitching device for bulk bag slings, including a support base. One end of the top of the support base is fixedly connected with a bottom plate. One end of the top of the bottom plate is fixedly connected with a pressing block, which can tightly fix the upper part of the bulk bag to prevent the bag body from shifting during stitching. One side of the pressing block is correspondingly connected with a stitching device, and the sewing head of the stitching device is aligned with the upper part of the bulk bag and can move left and right horizontally for stitching operations. The other end of the top of the bottom plate is correspondingly connected with a fixing device, which is used to clamp the two sides of the rear end of the bulk bag, making the area to be stitched of the bulk bag flatter when the stitching device works. The fixing device includes a pushing device and a grasping device. When the pushing device drives the grasping devices movably connected to its two ends to move, the two grasping devices will quickly move closer to the center, thereby realizing the grasping of both ends of the bulk bag and assisting the front-end stitching device to complete the stitching work; The bottom of the pushing device is fixedly connected with a lifting device, which will move horizontally driven by electricity. During the movement, the lifting device will drive the folding structures on both sides to unfold upward, realizing the adjustment of different heights, and further improving the use efficiency of the pushing device and the grasping device.

[0005] As a preferred technical solution of the present invention, the pushing device includes a cylinder, the bottom of the cylinder is fixedly connected with a lifting device, the output shaft end of the cylinder is fixedly connected with an L-shaped block, and both ends of the top of the groove of the L-shaped block are fixedly connected with a first rotating shaft.

[0006] As a preferred technical solution of the present invention, the outer surfaces of the tops of both first rotating shafts are movably connected with a first elliptical plate, the bottoms of both first elliptical plates are movably connected with a support frame, the bottoms of both support frames are movably connected with a sliding rod, and the bottom of the sliding rod is connected with the protruding part of the top of the L-shaped block. The tops of both support frames are fixedly connected with a clamping device.

[0007] As a preferred technical solution of the present invention, the clamping device includes two curved rods. The bottoms of the centers of the two curved rods are fixedly connected with the tops of the two support frames. Both ends of the two curved rods are movably connected with two long strip plates. One end of each of the four long strip plates is movably connected with one end of a second elliptical plate. The other ends of the four second elliptical plates are movably connected with a second rotating shaft. The bottoms of the four second rotating shafts are fixedly connected with one end of a support plate.

[0008] As a preferred technical solution of the present invention, the other ends of the tops of the four support plates are movably connected with two pushing plates. The inner sides of both ends of the two pushing plates are movably connected with two movable columns. The bottoms of the four movable columns are all connected through an elliptical block, and the bottoms of the four elliptical blocks are fixedly connected with the outer sides of the support plates. The tops of the four movable columns are correspondingly connected with clamping blocks.

[0009] As a preferred technical solution of the present invention, the lifting device includes two long plates. Both ends of the two long plates are fixedly connected with two triangular frames and two sliding tracks. The center grooves of the four sliding tracks are all movably connected with pulleys. Both ends of the four pulleys are movably connected with one end of a folding frame, and the other ends of the two folding frames are movably connected with the grooves of the four triangular frames.

[0010] As a preferred technical solution of the present invention, the intersections of the centers of the two folding frames are all movably connected with several third rotating shafts. The inner sides of the bottoms of the two folding frames are correspondingly connected with a pulling block. The center of the pulling block is movably connected with a threaded rod. The top of the threaded rod is movably connected with a motor, and the motor is fixedly connected with the top of one of the long plates. Both ends of the top of the other long plate are fixedly connected with connecting rods, and the tops of the two connecting rods are fixedly connected with the bottoms of the four support plates. [[ID=1)]]

[0011] Compared with the prior art, the beneficial effects of the present invention are: (1)A high-precision automatic sewing device for ton bag slings. By setting an L-shaped block at the output shaft end of the cylinder, under the drive of the cylinder, the L-shaped block is pushed to move. Since the two first rotating shafts are connected to the top of the groove of the L-shaped block, the L-shaped block will drive the two first rotating shafts to move together. Also, because the outer surfaces of the two first rotating shafts are movably connected to the top of the first elliptical plate, the first elliptical plate will move accordingly, thereby pulling the two support frames located at its bottom to move from both sides to the center on the outer surface of the sliding rod. Finally, the clamping device fixedly connected to the top of the support frame will move together with the movement of the support frame.

[0012] (2)A high-precision automatic sewing device for ton bag slings. By respectively setting the central bottoms of the two curved rods on the top of the support frame, when the curved rods follow the movement of the support frame, they will pull the two long strips movably connected to both ends of the curved rods to extend outward. Since both ends of the long strips are movably connected to one end of the second elliptical plate, the second elliptical plate will continue to twist the push plate movably connected to the other end to move toward the center.

[0013] (3)A high-precision automatic sewing device for ton bag slings. By setting one of the second elliptical plates and the second rotating shaft in the top groove of the push plate, as the two push plates approach the center, the movable columns connected to both ends will move back and forth on the top of the elliptical block. This not only plays a supporting role but also prevents the movable columns from deviating from their original positions when pushing the corresponding clamping blocks connected to the top forward. Finally, four clamping blocks are used to grasp and fix the two sides of the bottom of the ton bag.

[0014] (4)A high-precision automatic sewing device for ton bag slings. By setting the raised parts at both ends of the pulling block on the inner side of the bottom of the folding frame, after the motor drives power generation, it will drive the threaded rod movably connected to the output shaft end to rotate. The rotating threaded rod will drive the pulling block movably connected to its outer surface to move horizontally left and right, so that the raised parts on both sides of the pulling block can pull the folding frame to stretch upward. When the folding frame unfolds, the upper and lower sides at one end will move in the grooves of the triangular frame, and the upper and lower sides at the other end are connected with pulleys. These two pulleys will only slide back and forth in the grooves on the inner surface of the sliding track. This not only ensures that the pulleys can slide along the specified track but also improves the speed of the folding frame rising or folding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic side structure diagram of the present invention; Figure 2 It is a schematic front and side structure diagram of the present invention; Figure 3 It is a schematic overall diagram of the fixing device in the present invention; Figure 4Schematic diagram of the connection relationship between the pushing device and the gripping device in the present invention; Figure 5 Schematic diagram of the pushing device in the present invention; Figure 6 Schematic diagram of the gripping device in the present invention; Figure 7 Schematic diagram of the outer surface of the lifting device in the present invention; Figure 8 Schematic diagram of the inner surface of the lifting device in the present invention.

[0016] In the figure: 1, support base; 2, bottom plate; 3, pressing block; 4, sewing device; 5, fixing device; 51, pushing device; 511, cylinder; 512, L-shaped block; 513, first rotating shaft; 514, first elliptical plate; 515, support frame; 516, sliding rod; 52, gripping device; 521, curved rod; 522, long strip plate; 523, second elliptical plate; 524, second rotating shaft; 525, support plate; 526, pushing plate; 527, movable column; 528, elliptical block; 529, gripping block; 53, lifting device; 531, long plate; 532, triangular frame; 533, sliding track; 534, pulley; 535, folding frame; 536, third rotating shaft; 537, pulling block; 538, threaded rod; 539, motor; 5310, connecting rod. Detailed implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1: Please refer to Figures 1-2, A high-precision automatic sewing device for ton bag slings. A high-precision automatic sewing device for ton bag slings includes a support base 1. One end of the top of the support base 1 is provided with a bottom plate 2, and one end of the top of the support base 1 is fixedly connected to the bottom of the bottom plate 2. One end of the top of the bottom plate 2 is provided with a pressing block 3, and one end of the top of the bottom plate 2 is fixedly connected to the top end of the pressing block 3. The pressing block 3 can tightly fix the upper part of the ton bag to prevent the bag body from shifting during the sewing process. One side of the pressing block 3 is correspondingly connected to a sewing device 4. The sewing head of the sewing device 4 is aligned with the upper part of the ton bag and can move left and right horizontally for sewing operations. The other end of the top of the bottom plate 2 is correspondingly connected to a fixing device 5. The fixing device 5 is used to clamp the two sides of the rear end of the ton bag, making the area to be sewn of the ton bag flatter when the sewing device 4 works. The fixing device 5 includes a pushing device 51 and a grasping device 52. When the pushing device 51 drives the grasping device 52 movably connected to its two ends to move, the two grasping devices 52 will quickly move closer to the center, thereby realizing the grasping of the two ends of the ton bag and assisting the front-end sewing device 4 to complete the sewing work; The bottom of the pushing device 51 is provided with a lifting device 53, and the bottom of the pushing device 51 is fixedly connected to the top of the lifting device 53. The lifting device 53 will move horizontally driven by electricity. During the movement, the lifting device 53 will drive the folding structures on both sides to unfold upward, realizing the adjustment of different heights, and then improving the use efficiency of the pushing device 51 and the grasping device 52.

[0019] Embodiment 2: On the basis of Embodiment 1, as Figures 3-8 shown, the pushing device 51 includes a cylinder 511. The bottom of the cylinder 511 is provided with a lifting device 53, and the bottom of the cylinder 511 is fixedly connected to the top of the lifting device 53. The output shaft end of the cylinder 511 is provided with an L-shaped block 512, and the output shaft end of the cylinder 511 is fixedly connected to the rear end of the L-shaped block 512. Both ends of the top of the groove of the L-shaped block 512 are provided with a first rotating shaft 513, and both ends of the top of the groove of the L-shaped block 512 are fixedly connected to the bottom of the first rotating shaft 513.

[0020] On the outer surfaces of the tops of both of the first rotating shafts 513, first elliptical plates 514 are provided, and the outer surfaces of the tops of both of the first rotating shafts 513 are movably connected to the tops of the first elliptical plates 514. On the bottoms of both of the first elliptical plates 514, support frames 515 are provided, and the bottoms of both of the first elliptical plates 514 are movably connected to the bottoms of the support frames 515. On the bottoms of both of the support frames 515, sliding rods 516 are provided, and the grooves at the bottoms of both of the support frames 515 are movably connected to the outer surfaces of the tops of the sliding rods 516, and the bottom of the sliding rod 516 is connected to the protruding part at the top of the L-shaped block 512. By providing the L-shaped block 512 at the output shaft end of the air cylinder 511, under the drive of the air cylinder 511, the L-shaped block 512 is pushed to move. Since the two first rotating shafts 513 are connected to the top of the groove of the L-shaped block 512, the L-shaped block 512 will drive the two first rotating shafts 513 to move together. Also, because the outer surfaces of the two first rotating shafts 513 are movably connected to the tops of the first elliptical plates 514, the first elliptical plates 514 will move accordingly, thereby pulling the two support frames 515 located at their bottoms to move from both sides to the center on the outer surface of the sliding rod 516. Finally, the clamping device 52 fixedly connected to the top of the support frame 515 will move together with the movement of the support frame 515. On the tops of both of the support frames 515, a clamping device 52 is provided, and the tops of both of the support frames 515 are fixedly connected to both sides of the bottom of the clamping device 52.

[0021] The clamping device 52 includes two bent rods 521. The centers of the bottoms of the two bent rods 521 are fixedly connected to the tops of the two support frames 515. At both ends of the two bent rods 521, two long strip plates 522 are provided, and both ends of the two bent rods 521 are movably connected to the centers of the two long strip plates 522. At both ends of the four long strip plates 522, second elliptical plates 523 are provided, and both ends of the four long strip plates 522 are movably connected to one ends of the second elliptical plates 523. At the other ends of the four second elliptical plates 523, second rotating shafts 524 are provided, and the other ends of the four second elliptical plates 523 are movably connected to the tops of the second rotating shafts 524. At the bottoms of the four second rotating shafts 524, support plates 525 are provided. By respectively arranging the centers of the bottoms of the two bent rods 521 on the tops of the support frames 515, when the bent rods 521 move following the support frames 515, the two long strip plates 522 movably connected to both ends of the bent rods 521 will be pulled to stretch outwards. Since both ends of the long strip plates 522 are movably connected to one end of the second elliptical plates 523, the second elliptical plates 523 will continue to twist and push the plates 526 movably connected to the other ends to move towards the center. And the bottoms of the four second rotating shafts 524 are fixedly connected to one end of the tops of the support plates 525.

[0022] At the other end of the top of the four support plates 525, two pushing plates 526 are provided, and the other end of the top of the four support plates 525 is movably connected to the bottom of the two pushing plates 526. At the inner sides of both ends of the two pushing plates 526, two movable columns 527 are provided, and at the inner sides of both ends of the two pushing plates 526, they are movably connected to the tops of the two movable columns 527. At the bottoms of the four movable columns 527, oval blocks 528 are provided, and at the bottoms of the four movable columns 527, they are connected through the grooves at the tops of the oval blocks 528, and the bottoms of the four oval blocks 528 are fixedly connected to the outer sides of the support plates 525. By arranging one of the second oval plates 523 and the second rotating shaft 524 in the top groove of the pushing plate 526, as the two pushing plates 526 move closer to the center, the movable columns 527 connected to both ends thereof will move back and forth on the tops of the oval blocks 528. This can not only play a supporting role but also prevent the movable columns 527 from deviating from their original positions when pushing the corresponding clamping blocks 529 connected to the top forward. Finally, the bottom sides of the ton bag are grasped and fixed by the four clamping blocks 529, and the area to be sewn of the ton bag is pulled flatter. At the tops of the four movable columns 527, clamping blocks 529 are provided, and at the tops of the four movable columns 527, they are correspondingly connected to the bottoms of the clamping blocks 529.

[0023] The lifting device 53 includes two long plates 531. At both ends of the two long plates 531, two triangular frames 532 and two sliding tracks 533 are provided, and at both ends of the two long plates 531, they are fixedly connected to the bottoms of the two triangular frames 532 and the two sliding tracks 533. At the central grooves of the four sliding tracks 533, pulleys 534 are provided, and at the central grooves of the four sliding tracks 533, they are movably connected to the outer surfaces of the pulleys 534. At both ends of the four pulleys 534, folding frames 535 are provided, and at both ends of the four pulleys 534, they are movably connected to the upper and lower ends of the folding frames 535, and the upper and lower sides of the other ends of the two folding frames 535 are movably connected to the grooves of the four triangular frames 532.

[0024] Several third rotating shafts 536 are provided at the intersection centers of the two folding frames 535, and both intersection centers of the two folding frames 535 are movably connected to both ends of the several third rotating shafts 536. Pulling blocks 537 are arranged on the inner sides of the bottoms of the two folding frames 535, and the inner sides of the bottoms of the two folding frames 535 are correspondingly connected to the protruding parts on both sides of the pulling blocks 537. A threaded rod 538 is arranged at the center of the pulling block 537, and the center of the pulling block 537 is movably connected to the outer surface of the threaded rod 538. A motor 539 is arranged at the top of the threaded rod 538, and the top of the threaded rod 538 is movably connected to the output shaft end of the motor 539. The bottom of the motor 539 is fixedly connected to the top of one of the long plates 531. Connecting rods 5310 are arranged at both ends of the top of the other long plate 531. By arranging the protruding parts at both ends of the pulling block 537 on the inner side of the bottom of the folding frame 535, after the motor 539 is driven to generate electricity, it will drive the threaded rod 538 movably connected to the output shaft end to rotate. The rotating threaded rod 538 will drive the pulling block 537 movably connected to its outer surface to move horizontally left and right, so that the protruding parts on both sides of the pulling block 537 can pull the folding frame 535 to extend upward. When the folding frame 535 is unfolded, the upper and lower sides of one end thereof will move in the grooves of the triangular frame 532, and the upper and lower sides of the other end are connected with pulleys 534. These two pulleys 534 will only slide back and forth at the grooves on the inner surface of the sliding track 533. This not only ensures that the pulleys 534 can slide along the specified track, but also improves the rising or folding speed of the folding frame 535. Finally, the connecting rods 5310 at both ends of the top of one of the long plates 531 drive the gripper device 52 and the pushing device 51 to adjust the height, so as to be adapted to different sewing devices. The two ends of the top of the other long plate 531 are fixedly connected to the bottoms of the connecting rods 5310, and the tops of the two connecting rods 5310 are fixedly connected to the bottoms of the four support plates 525.

[0025] The working principle of the present invention is as follows: Overall fixing and preliminary positioning: The support base 1 serves as the foundation of the entire device and provides stable support for other components. The pressing block 3 can press and fix the upper part of the ton bag to prevent the bag body from shifting during the sewing process and complete the preliminary positioning of the ton bag; Sewing work: The sewing head of the sewing device 4 is aligned with the upper part of the ton bag and can move left and right in the horizontal direction. On the basis of the preliminary fixing of the ton bag by the pressing block 3, sewing operations are performed on the ton bag; Driving principle: The pushing device 51 includes a cylinder 511, and the cylinder 511 drives the L-shaped block 512 connected to the output shaft end thereof to move. Since the two first rotating shafts 513 are fixed to the top of the groove of the L-shaped block 512, when the L-shaped block 512 drives the first rotating shaft 513 to move together, the first rotating shaft 513 can pull the first elliptical plate 514 that is movable on the outer surface to move to both sides, and finally the first elliptical plate 514 can pull the two support frames 515 at the other end to move while also moving from both sides to the center on the outer surface of the sliding rod 516. In this way, the clamping device 52 will move towards the center together with the movement of the support frame 515, realizing the grasping of the two sides at the rear end of the ton bag, making the area to be sutured of the ton bag flatter, and assisting the stitching device 4 to work; Principle of clamping the ton bag: In the clamping device 52, the bottom of the centers of the two curved rods 521 is fixed to the top of the support frame 515. When the curved rods 521 move with the support frame 515, they will pull the long strip plates 522 movably connected to their two ends to stretch. Since the two ends of the long strip plate 522 are respectively connected to one end of the second elliptical plate 523, when one end of the second elliptical plate 523 is swung, the other end will shift towards the center under the pulling force, so that one of the second elliptical plates 523 can pull the push plate 526 at the bottom of the second rotating shaft 524 to move towards the center together. As the two push plates 526 approach the center, the movable columns 527 connected to their two ends will move back and forth on the top of the elliptical block 528, which not only plays a supporting role, but also prevents the movable columns 527 from deviating from their positions when pushing the corresponding clamping blocks 529 connected to the top forward. Finally, the four clamping blocks 529 are used to grasp and fix the two sides of the bottom of the ton bag, and the area to be sutured of the ton bag is pulled flat; Lifting principle: Driven by the motor 539, the lifting device 53 will make the threaded rod 538 connected to the output shaft end thereof rotate. When the rotation of the threaded rod 538 drives the pulling block 537 movably connected to the outer surface to move horizontally left and right, the pulling block 537 will pull the folding frame 535 connected to the protruding parts at both ends to stretch upward during the movement. At this time, the folding frame 535 is in an expanded state. During the unfolding process, the upper and lower sides of one end of the folding frame 535 will move in the groove of the triangular frame 532, while the upper and lower sides of the other end will slide back and forth in the groove on the inner surface of the sliding track 533 by using the pulley 534 to ensure that the pulley 534 slides along the specified track, improving the speed of raising or folding the folding frame 535. Finally, during the lifting process of the folding frame 535, the clamping device 52 and the pushing device 51 can be driven to adjust the height to adapt to different stitching devices; In summary, the high-precision automatic sewing device for the straps of the bulk bag realizes the high-precision automatic sewing of the straps of the bulk bag through the preliminary fixation of the pressing block 3, the sewing operation of the sewing device 4, the clamping and flattening of the bulk bag by the fixing device 5, and the height adjustment of the lifting device 53, with the cooperation of each device.

[0026] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic high-precision sewing device for the sling of a bulk bag, comprising a support base (1). One end of the top of the support base (1) is fixedly connected to a bottom plate (2). One end of the top of the bottom plate (2) is fixedly connected to a pressing block (3). The pressing block (3) can tightly fix the upper part of the bulk bag to prevent the bag body from displacing during the sewing process. One side of the pressing block (3) is correspondingly connected to a sewing device (4). The sewing head of the sewing device (4) is aligned with the upper part of the bulk bag and can move left and right horizontally for sewing operations. It is characterized in that: At the other end of the top of the bottom plate (2), a fixing device (5) is correspondingly connected. The fixing device (5) is used to clamp the two sides of the rear end of the ton bag, so that when the sewing device (4) works, the area to be sewn of the ton bag is flatter. The fixing device (5) includes a pushing device (51) and a clamping device (52). When the pushing device (51) drives the clamping device (52) movably connected to its two ends to move, the two clamping devices (52) will quickly move closer to the center, so as to realize the grasping of the two ends of the ton bag and assist the front-end sewing device (4) to complete the sewing work. The bottom of the pushing device (51) is fixedly connected with a lifting device (53). The lifting device (53) will move horizontally driven by electricity. During the moving process, the lifting device (53) will drive the folding structures on both sides to unfold upward, realize the adjustment of different heights, and further improve the use efficiency of the pushing device (51) and the clamping device (52).

2. The high-precision automatic sewing device for the sling of the ton bag according to claim 1, wherein: The pushing device (51) includes a cylinder (511). The bottom of the cylinder (511) is fixedly connected with a lifting device (53). The output shaft end of the cylinder (511) is fixedly connected with an L-shaped block (512). At both ends of the top of the groove of the L-shaped block (512), a first rotating shaft (513) is fixedly connected.

3. The high-precision automatic sewing device for the sling of a ton bag according to claim 2, characterized in that: On the outer surfaces of the tops of the two first rotating shafts (513), first elliptical plates (514) are movably connected. At the bottoms of the two first elliptical plates (514), support frames (515) are movably connected. At the bottoms of the two support frames (515), a sliding rod (516) is movably connected, and the bottom of the sliding rod (516) is connected to the protruding part of the top of the L-shaped block (512). At the tops of the two support frames (515), a clamping device (52) is fixedly connected.

4. The high-precision automatic sewing device for the sling of a ton bag according to claim 3, wherein: The clamping device (52) includes two curved rods (521). The centers of the bottoms of the two curved rods (521) are fixedly connected to the tops of the two support frames (515). At both ends of the two curved rods (521), two long strip plates (522) are movably connected. At one ends of the four long strip plates (522), second elliptical plates (523) are movably connected. At the other ends of the four second elliptical plates (523), second rotating shafts (524) are movably connected. At one ends of the bottoms of the four second rotating shafts (524), support plates (525) are fixedly connected.

5. An automatic high-precision sewing device for the sling of a ton bag, according to claim 4, characterized in that: At the other ends of the tops of the four support plates (525), two pushing plates (526) are movably connected. At the inner sides of both ends of the two pushing plates (526), two movable columns (527) are movably connected. At the bottoms of the four movable columns (527), elliptical blocks (528) are connected through. And the bottoms of the four elliptical blocks (528) are fixedly connected to the outsides of the support plates (525). At the tops corresponding to the four movable columns (527), clamping blocks (529) are connected.

6. The high-precision automatic sewing device for the sling of a ton bag according to claim 2, characterized in that: The lifting device (53) includes two long plates (531), and two triangular frames (532) and two sliding rails (533) are fixedly connected to both ends of the two long plates (531). Pulley (534) is movably connected to the central groove of the four sliding rails (533). Both ends of the four pulleys (534) are movably connected to one end of the folding frame (535), and the other ends of the two folding frames (535) are movably connected to the grooves of the four triangular frames (532).

7. An automatic high-precision sewing device for the sling of a ton bag, according to claim 6, characterized in that: A plurality of third rotating shafts (536) are movably connected to the intersection centers of the two folding frames (535). Pulling blocks (537) are correspondingly connected to the inner sides of the bottoms of the two folding frames (535). A threaded rod (538) is movably connected to the center of the pulling block (537). The top of the threaded rod (538) is movably connected to a motor (539), and the bottom of the motor (539) is fixedly connected to the top of one of the long plates (531). Connecting rods (5310) are fixedly connected to both ends of the top of the other long plate (531), and the tops of the two connecting rods (5310) are fixedly connected to the bottoms of the four support plates (525).

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