Fabric roll automatic packaging production line and control method

Abstract

The application discloses a kind of fabric roll automatic packaging production line and control method, belong to the technical field of automatic packaging machinery, the production line includes main conveying line, fabric advancing mechanism, bionic bag opening mechanism and flat edge sealing mechanism are sequentially arranged on main line;It also includes independently arranged in the side of main line bag feeding mechanism, for the lateral sliding handover of prefabricated woven bag to main line.The layout of the side bag feeding of the application realizes continuous feeding without stopping and reduces the floor area;Bionic mechanism uses the timing of "first lateral flattening, then rigid clamping", completely eliminates the pain point that inelastic woven bag is easily torn;With adaptive bag supporting algorithm, the size of fabric is infinitely compatible;Finally, through the rigid extrusion of flat edge sealing mechanism Suture, avoid continuous roll bag cutting pollution and wrinkle needle hidden trouble.The application effectively improves the running rate and environmental protection of equipment.

Description

Technical Field

[0001] This invention belongs to the field of automated packaging machinery technology, specifically relating to an automatic packaging production line and control method for fabric rolls. Background Technology

[0002] In recent years, with the rapid development of e-commerce logistics and the textile manufacturing industry, the demand for automated packaging of large-sized roll materials (such as fabric rolls, carpets, etc.) has been increasing. In warehousing and transportation, the industry widely uses flat woven bags as the main packaging material. However, prefabricated flat woven bags are relatively stiff and have almost no elasticity, and different batches of fabric rolls have continuous fluctuations in diameter and length, which poses a great challenge to the development of fully automated packaging equipment.

[0003] Currently, the industry has explored various technologies for automated packaging equipment for fabric rolls. For example, Chinese patent document CN118004544B discloses a multi-specification automatic bagging production line. This solution represents a common technical route in the field: it adopts a linear series layout, and adapts fabric rolls of different sizes by transversely moving multiple sets of preset "physical bagging molds"; it uses continuous roll woven bags, and after bagging, it uses a cylinder to clamp and pull backward to achieve bagging, and then uses an electric heating wire for hot melting and cutting. Finally, the bag opening is pressed by a pressure plate, and two sets of sewing machines simultaneously sew the openings at both ends.

[0004] Although the above solutions and other general-purpose automated packaging equipment on the market have reduced the intensity of manual labor to some extent, this field generally faces the following common technical challenges that urgently need to be addressed in large-scale industrial production:

[0005] First, the surface of prefabricated woven bags has air-permeable pores, making traditional vacuum suction cups prone to leakage and failure, resulting in highly unstable automatic feeding (bag suction). Prefabricated flat woven bags (such as PP woven bags) are made of interwoven plastic flat yarns, and their physical characteristics determine that there are many tiny air-permeable gaps on the bag surface, making them not airtight materials. Traditional automated packaging equipment usually uses conventional rubber vacuum suction cups for gripping. When the suction cup contacts the surface of the woven bag, air leaks rapidly from the woven pores, making it impossible to establish and maintain an effective vacuum negative pressure inside the suction cup. This directly leads to frequent failures when automated equipment grips woven bags, such as "failing to pick up," "falling off halfway," or "picking up multiple bags at once" due to electrostatic friction. This bag suction failure caused by the air permeability of consumables is a fundamental technical bottleneck restricting the fully automated feeding of woven bags.

[0006] Secondly, the lack of stepless size adaptation capability results in poor compatibility and packaging quality. Neither the discrete matching method of "physically switching multiple sets of bagging molds" in the aforementioned patents, nor the fixed-stroke bag-supporting mechanism in traditional equipment, can achieve continuous stepless adaptation to the fabric roll size. When the actual size of the fabric roll falls within the preset specifications, the fabric is prone to jamming during insertion, or the bag may be too loose after packaging, failing to create a tightly fitting and high-quality packaging appearance.

[0007] Third, prefabricated flat woven bags are extremely prone to tearing due to their lack of elasticity, making "automatic bag opening" a major bottleneck for the industry and forcing long-term reliance on manual labor. Prefabricated flat woven bags (such as high-grammage PP woven bags) are tough but have almost no elasticity. In the bag opening process, if conventional automated mechanical structures are used (such as using grippers to rigidly clamp the bag opening and then pulling it outwards, or using rigid molds to forcibly open it), the outward mechanical force will be concentrated at the clamping point because the bag cannot stretch and release the force, inevitably causing kinematic interference, directly tearing the bag opening or causing the servo equipment to stop and jam. It is precisely because of the extremely high scrap rate and equipment downtime rate caused by traditional mechanical pulling that the packaging of prefabricated bags for fabric rolls has not yet achieved true automation. Most factories can only compromise at this point and are forced to adopt inefficient, high-cost, and extremely labor-intensive "manual bag opening and bagging".

[0008] Fourth, the overall line layout is lengthy, making material replenishment and human-machine interaction difficult. Most common equipment in the field (including the aforementioned comparative patents) adopts a linear layout where bag feeding, bag opening, material filling, and sewing are sequentially connected. This layout not only results in a large longitudinal footprint for the entire line, but more importantly, because packaging materials (pre-made bags or roll bags) are located at critical nodes on the main line, when materials are depleted, operators often need to stop the entire line and traverse complex mechanical structures to replenish them, leading to a significant reduction in the overall utilization rate of the equipment.

[0009] Fifth, the lack of a dynamic sorting mechanism at the bag opening leads to a high rate of needle breakage and rejects. The fabric roll, being cylindrical, is highly susceptible to rolling and skewing during transport and bagging. Current technology typically relies solely on simple upper and lower pressure plates to firmly hold the bag opening in place before sewing. If the bag opening is already skewed or wrinkled, directly pressing it down will solidify the wrinkles, resulting in uneven fabric thickness or misalignment when entering the sewing machine. This can lead to serious malfunctions such as skipped stitches, broken needles, and even damage to the sewing machine head.

[0010] In summary, the field of automated packaging of fabric rolls urgently needs a new technical solution that can completely eliminate the kinematic deadlock of rigid bag opening based on optimized spatial layout, achieve algorithm-level stepless self-adaptation for fabrics of any size, and fundamentally solve the problem of broken needles caused by folds at the bag opening. Summary of the Invention

[0011] This invention aims to overcome the shortcomings of existing technologies. It proposes an automated fabric roll packaging production line and control method. Addressing the technical problems in existing automated fabric roll packaging equipment, such as easy air leakage and failure during prefabricated woven bag feeding, easy tearing due to lack of elasticity and hard pulling, poor fabric roll size compatibility, redundant overall line layout, and easy needle breakage due to bag opening pleats, this invention provides an automated full-process solution based on the coordinated linkage of core mechanisms such as side bag feeding, biomimetic flexible bag opening, size adaptive bag support, and flat sealing. It aims to improve the operational stability, packaging yield, and space utilization of the equipment.

[0012] This invention proposes an automatic packaging production line for fabric rolls, including a main conveyor line arranged along the material conveying direction, i.e., the Y-axis, and a fabric pushing mechanism, a bionic bag opening mechanism, and a flat sealing mechanism arranged sequentially on the main conveyor line.

[0013] The production line also includes a bag feeding mechanism, which is independently arranged on the side of the feed end of the main conveyor line;

[0014] The bag feeding mechanism can slide and connect with the main conveyor line across the side hopper, transferring the pre-made flat woven bags from the side and laying them flat on the working surface of the bionic bag opening mechanism on the main conveyor line; the bionic bag opening mechanism is used to pre-open the flat woven bags with negative pressure from the top and bottom, and after probing into the pre-opening and spreading them outward laterally, it opens them in the vertical direction to form a packaging channel.

[0015] The fabric feeding mechanism is used to push the fabric roll into the packaging channel;

[0016] The flattening and sealing mechanism is used to rigidly compress and flatten the opening of the woven bag after it has been filled with fabric, and then sew it up.

[0017] Preferably, the bionic bag opening mechanism includes a negative pressure pre-opening component and a bidirectional clamping and supporting bag component;

[0018] The negative pressure pre-opening assembly includes a lower suction cup fixedly embedded in the working surface of the main conveyor line, and a lifting suction cup positioned directly above it that can be raised and lowered; the bidirectional clamping and supporting bag assembly includes an upper moving gripper mechanism and a lower moving gripper mechanism; both the upper and lower moving gripper mechanisms are connected to a transverse drive component for driving the gripper to move in opposite or opposite directions in the transverse direction; the upper moving gripper mechanism is also connected to a vertical drive component for driving the gripper to rise and fall in the vertical direction; the front end of the gripper has an upper and lower concave-convex structure, and the gripper is equipped with a cylinder, the cylinder push rod cooperating with the gripper to form an opening and closing clamping part.

[0019] Preferably, the bag supply mechanism includes a bag placement base, a lifting platform mounted on the bag placement base, a first moving frame located above and driven by a servo motor to slide laterally along the Y-axis, and a suction device mounted on the lower side of the first moving frame; the bottom of the lifting platform is connected to a Z-axis height compensation drive mechanism; the suction device is equipped with a plurality of downwardly distributed vacuum suction cups, and has an internal gear and rack transmission mechanism for adjusting the lateral and longitudinal spacing between each suction cup.

[0020] Preferably, the vacuum suction cup of the bag feeding mechanism has multiple small holes staggered at the bottom, which converge at the top to the main air intake and are connected to a centrifugal fan. The wind speed of the small holes reaches 3 m / s during operation. A photoelectric sensor for detecting the suction status of the woven bag is provided on the side of the vacuum suction cup.

[0021] Preferably, the edge-sealing mechanism includes an edge-sealing machine moving device and a main body with a sewing machine head; the feeding side of the sewing machine head is provided with a forced guide clamping assembly, which consists of an upper pressure rod and a lower pressure rod that are parallel to each other, forming a narrow guide gap of fixed height between them, and the center line of the guide gap is parallel to the sewing trajectory of the sewing machine head;

[0022] Four fabric roll detection sensors with downward-facing probes are arranged horizontally side by side above the feed side of the sewing machine head to detect the rolling offset of the fabric roll during the conveying process.

[0023] The present invention also provides a control method based on any of the above-described production lines, including a biomimetic bag-opening step, specifically:

[0024] S1: The lower suction cup and the lifting suction cup respectively adsorb the bottom and top layers of the woven bag and separate them outward to form a pre-opening;

[0025] S2: The bidirectional clamping support bag assembly moves forward, and the left, right, up, and down grippers, in the unclamped state after the cylinder is released, probe into the pre-opening;

[0026] S3: The horizontal drive components of the upper and lower mechanisms start synchronously, driving the two grippers to move outward to the left and right ends in an unclamped state until the grippers reach the left and right sides of the woven bag, and completely flatten the bag opening in the horizontal direction.

[0027] S4: After the bag opening is horizontally flattened, the gripper cylinders of the upper and lower mechanisms move synchronously, using the concave and convex structure at the front end to rigidly clamp and lock the flattened bag opening edge.

[0028] S5: After clamping is completed, the vertical drive component drives the upper moving gripper mechanism to lift vertically, opening the bag opening into a rectangular channel.

[0029] Preferably, in step S5, the vertical lifting height depends on the built-in support bag size algorithm: the vertical opening height set by the control system is h=0.5×(d-2l);

[0030] Where h is the vertical lifting height of the upper moving gripper mechanism, l is the width parameter of the fabric roll, and d is the circumference parameter of the woven bag, to ensure that the packaging channel after being stretched out is fully adapted to the size of the fabric roll.

[0031] Preferably, the working logic of the production line also includes a flattening and sealing step, specifically: four fabric roll detection sensors arranged horizontally side by side above the flattening and sealing mechanism detect the passing woven bags and fabric rolls in real time.

[0032] When none of the four fabric roll detection sensors detect a signal, it is determined that the fabric roll that has deviated has completely passed through, and the main conveyor line is stopped; at this time, the edge of the bag opening is cut into the guide gap formed by the upper and lower pressure rods for rigid compression;

[0033] Then, the sewing machine is started, and the bag opening is smoothly passed through the machine head under the pressure bar to complete the sewing.

[0034] The technical solution of the present invention has at least the following technical effects:

[0035] 1. This invention adopts the "flatten first, then clamp" opening sequence, which avoids the local tearing stress generated when the inelastic woven bag is "directly clamped and pulled hard" in the traditional way. It solves the technical problem that the bag opening is very easy to tear, significantly reduces the damage rate of consumables, and ensures the stability of equipment operation.

[0036] 2. This invention places the transverse conveying module parallel to the side of the main conveyor line for single-bag transverse sliding and handover. This design breaks the problem of the long longitudinal length of the whole machine caused by the traditional straight-line series connection, and isolates an independent human-machine interaction area in physical space, so that the operator can replenish woven bags laterally without stopping the main line, which greatly reduces the equipment footprint and improves the overall operating efficiency of the line.

[0037] 3. The bag supply mechanism of the present invention is equipped with a dedicated bag suction component. By optimizing the sealing and wrapping properties of the end face, it can effectively overcome the air permeability of the bag surface and quickly establish a stable negative pressure, solving the technical problems of poor adsorption and easy fall of consumables, and ensuring the accurate separation and extraction of pre-made single bags.

[0038] 4. This invention directly uses a single prefabricated woven bag, and the entire process only requires single-end opening and sewing. This solution eliminates the "electrothermal cutting + double-end sewing" process necessary for continuous roll packaging, completely eliminating the risk of needle breakage caused by cutting fume pollution and hot-melt hard edges. It not only effectively simplifies the mechanical steps, but also significantly reduces the equipment failure rate of subsequent sewing processes.

[0039] 5. The control system of this invention is pre-programmed with an adaptive algorithm. It acquires the fabric roll width d and the woven bag folding diameter l, and uses the adaptive algorithm h=0.5(d-2l) to calculate in real time and drive the servo push rod to precisely adjust the spacing of the spreading arms. This design replaces the cumbersome and heavy-duty "physical mold changing" mechanism in existing technologies. The equipment can automatically accommodate fabric rolls with continuously fluctuating dimensions without requiring downtime to replace any hardware, solving the problems of material jamming and loose packaging caused by stepped matching. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the production line structure according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the fabric feeding mechanism according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram a of the motion of the fabric propulsion mechanism according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram (b) of the motion of the fabric propulsion mechanism according to an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the bag supply mechanism according to an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of a square tube suction cup according to an embodiment of the present invention;

[0046] Figure 7 This is a schematic diagram of the bottom of the square tube suction cup according to an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the biomimetic bag-opening mechanism according to an embodiment of the present invention;

[0048] Figure 9 This is a schematic diagram of the negative pressure pre-opening component according to an embodiment of the present invention;

[0049] Figure 10 This is a schematic diagram of a bidirectional clamping support bag assembly according to an embodiment of the present invention;

[0050] Figure 11 This is a partial schematic diagram of the upper claw hand in an embodiment of the present invention;

[0051] Figure 12 This is a schematic diagram of the flattening and sealing mechanism according to an embodiment of the present invention;

[0052] Among them, 1 is the fabric feeding machine, 110 is the moving plate, 120 is the linear guide rail, 130 is the first synchronous belt, 140 is the first push rod, 150 is the second push rod, 160 is the second synchronous belt, 2 is the bag feeding mechanism, 210 is the bag placement base, 220 is the lifting platform, 230 is the first moving frame, 240 is the suction device, 3 is the bionic bag opening mechanism, 310 is the negative pressure pre-opening component, 311 is the lower tube suction cup, 312 is the lifting suction cup, 313 is the bag opening detection sensor, 314 is the bag positioning sensor, 320 is the bidirectional clamping and supporting bag component, and 321 is... The upper moving gripper mechanism consists of: 321.1 upper gripper base plate, 321.2 third synchronous belt, 321.3 fourth servo motor, 321.4 upper gripper base, 321.5 upper gripper, and 321.6 upper gripper cylinder; the lower moving gripper mechanism consists of: 322.1 lower gripper base, 322.2 lower gripper; 4 is the flat sealing mechanism; 410 is the sealing machine moving device; 420 is the main body with a sewing machine head; 421 is the forced guide clamping assembly; 421.1 is the upper pressure rod; 421.2 is the lower pressure rod; and 421.3 is the bag sensor. Detailed Implementation

[0053] This invention provides an automated fabric roll packaging production line and control method. The overall concept is as follows: by placing the bag feeding mechanism to the side, continuous feeding of the main line is achieved without stopping the machine; a dedicated suction device overcomes the air gaps in the woven bag to achieve stable feeding; a biomimetic bag opening mechanism executes a "flatten first, then clamp" action sequence, combined with a size adaptive algorithm, to eliminate tearing stress at the bag opening while achieving infinite compatibility of fabric sizes; subsequently, a fabric pushing mechanism smoothly pushes the fabric roll into the packaging channel; finally, the narrow guide gap of the flattening and sealing mechanism forces the bag opening flattened and sewn. All mechanisms on the entire line work in an orderly manner under the coordination of the control system, completely overcoming the technical bottleneck of fully automated packaging of prefabricated flat woven bags.

[0054] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0055] Example 1

[0056] Please refer to Figure 1 This embodiment provides an automated fabric roll packaging production line, which includes a fabric feeding machine 1, a bag feeding mechanism 2, a bionic bag opening mechanism 3, and a flattening and sealing mechanism 4 arranged sequentially. The specific mechanical structure and working principle of each core mechanism are as follows:

[0057] (1) Fabric propulsion mechanism

[0058] Please refer to Figure 2The fabric feeding mechanism has the following mechanical structure: Located at the feed end of the conveyor line, it includes a movable plate 110, which is slidably mounted on the linear guide rail 120 of the frame. The movable plate 110 is connected to a first synchronous belt 130, which is driven by a first servo motor to reciprocate the movable plate 110 along the conveying direction (Y-axis). A first push rod 140 and a second push rod 150 are symmetrically arranged on the movable plate 110, and are respectively connected to the two side branches of a second synchronous belt 160. The second synchronous belt 160 is driven by a second servo motor to drive the first push rod 140 and the second push rod 150 to move synchronously in opposite directions or in opposite directions along the transverse direction (X-axis).

[0059] Please refer to Figures 3-4 Fabric propulsion mechanism workflow:

[0060] After the fabric roll to be packaged is placed at the workstation, the first servo motor drives the first synchronous belt 120 to move the moving plate 110 along the Y-axis to the designated position of the fabric roll.

[0061] The second servo motor drives the second synchronous belt 160, which in turn drives the first push rod 140 and the second push rod 150 to move inward relative to each other. The push rods on both sides fit against the edge of the fabric roll and clamp it through tension control. Then, the first servo motor starts again, which drives the moving plate 110 to move forward as a whole. The first push rod 140 and the second push rod 150 push the fabric roll into the already opened woven bag.

[0062] After the fabric is rolled into the bag, the second servo motor reverses to open the two push rods outward to release the fabric, and the first servo motor reverses to return the moving plate to the initial position.

[0063] (2) Bag supply mechanism

[0064] Please refer to Figure 5 The bag feeding mechanism 2 has the following mechanical structure: Located beside the main conveyor line, it includes a bag-feeding base 210 and a lifting platform 220 mounted thereon. The lifting platform 220 is used to stack pre-made flat woven bags and is connected to a Z-axis height compensation drive mechanism. Above the bag feeding mechanism 2 is a first moving frame 230, driven by a third servo motor, which can slide laterally across the side hopper (i.e., the lifting platform 220) and connect laterally to the main conveyor line. A suction device 240 is located on the lower front end of the first moving frame 230, equipped with several downwardly distributed vacuum suction cups. This suction device has a spacing adjustment mechanism to adjust the lateral and longitudinal spacing between the suction cups.

[0065] In this embodiment, the pitch adjustment mechanism can be a gear and rack transmission mechanism.

[0066] In this embodiment, the Z-axis height compensation drive mechanism of the lifting platform 220 is a lead screw height adjustment mechanism.

[0067] Please refer to Figures 6-7 In this embodiment, the vacuum suction cup has multiple small holes staggered at the bottom and a main air intake at the top, which is connected to a centrifugal fan. During operation, the air velocity through the small holes reaches 3 meters per second, which is effective for sucking up pre-fabricated flat woven bags.

[0068] Workflow:

[0069] During production, the third servo motor drives the first moving frame 230 to directly above the lifting platform 220. After the main control system pre-adjusts the suction cup spacing, the suction device 240 descends to pick up the top layer of woven bags. Each suction cup has a photoelectric sensor; if all the suction cups are holding bags, the photoelectric sensor will detect them. If the photoelectric sensor does not detect a bag, it means the suction cups are not holding the bag, possibly because the bags are used up or are not neatly arranged. In this case, an alarm signal is issued, prompting the worker to check the material hopper. The lifting platform rises in a timely manner according to the consumption of woven bags to maintain a constant bag-picking height.

[0070] If the suction is normal, the suction device is lifted, and the first moving frame 230 moves the flat woven bag from the side of the conveyor line to the main conveyor line and lays it flat on the working surface of the bionic bag opening mechanism.

[0071] (3) Bionic bag opening mechanism

[0072] Please refer to Figure 8 The mechanical structure of the bionic bag opening mechanism 3 is as follows: the mechanism is adjacent to the bag supply mechanism 2 and includes a negative pressure pre-opening component 310 and a bidirectional clamping and supporting bag component 320.

[0073] Please refer to Figure 9 The specific structure of the negative pressure pre-opening component 310 is as follows: it includes a lower tube suction cup 311 fixedly embedded in the working surface of the conveyor line. The lower tube suction cup 311 is provided with a bag positioning sensor 314 at the end facing the woven bag. The top of the lower tube suction cup 311 is provided with an array of staggered adsorption holes, which are connected to a vacuum source inside. A lifting suction cup 312 driven by a vertical drive is provided directly above it. The side of the lifting suction cup 312 is provided with a bag opening detection sensor 313.

[0074] Please refer to Figures 10-11The specific structure of the bidirectional gripper bag assembly 320 is as follows: it includes an upper moving gripper mechanism 321 and a lower moving gripper mechanism 322. The upper moving gripper mechanism 321 includes an upper gripper base plate 321.1 driven by a servo cylinder for Z-axis lifting. The base plate is equipped with a third synchronous belt 321.2 and a fourth servo motor 321.3 arranged along the X-axis. Two upper gripper bases 321.4 are fixed to the two sides of the third synchronous belt 321.2. An upper gripper 321.5 and an upper gripper cylinder 321.6 are mounted on the upper gripper bases 321.4. The front end of the upper gripper 321.5 has an upper and lower concave-convex structure. The cylinder 321.6 push rod cooperates with the upper gripper 321.5 to form an opening and closing gripping part. The lower moving gripper mechanism 322 is fixed in position on the Z-axis. Its horizontal driving structure is the same as the upper part, and it includes a lower gripper base 322.1, a fourth synchronous belt, a fifth servo motor, and a lower gripper 322.2 with a cylinder.

[0075] Workflow:

[0076] Once the bag positioning sensor 314 detects that the bag is laid flat in place, the lower suction cup 311 adheres to the bottom layer of the bag, while the lifting suction cup 312 descends to hold the top layer and pulls it upwards. The bag opening detection sensor 313 detects the upper and lower bag walls to confirm the pre-opening has been formed.

[0077] The bidirectional clamping and supporting bag assembly 320 moves forward along the Y-axis. At this time, the gripper cylinder is in the released state, and the left, right, upper and lower grippers probe into the pre-opening, so that the upper and lower edges of the woven bag are initially placed in the concave and convex groove area of ​​the gripper. The servo motors of the upper and lower mechanisms start synchronously, driving the synchronous belt to move the grippers on both sides to the left and right sides outward in the unclamped state until the grippers reach the left and right sides of the woven bag, and completely flatten the bag opening in the X-axis direction. After the bag opening is flattened laterally, the gripper cylinders of the upper and lower mechanisms move synchronously, the push rod presses down, and the concave and convex structure at the front end rigidly clamps and locks the dead point of the flattened bag opening edge.

[0078] After clamping, the downward moving gripper maintains a constant Z-axis height to flatten the bottom edge of the bag opening. The servo cylinder starts, causing the upper gripper base plate to rise vertically, opening the bag opening into a rectangular channel. The fabric feeding mechanism pushes the fabric roll in. Once the head of the fabric is inside the bag, the gripper cylinder releases, the gripper retracts inward and retracts, preventing the fabric from fully entering the bag.

[0079] The lower suction cup and the lifting suction cup are equipped with bag opening detection sensors. If the bag opening is not sucked open, the corresponding sensor will not detect the bag, and the control system will issue an alarm, requiring manual intervention to check the bag.

[0080] In this embodiment, the control system has a built-in bag-expanding size algorithm: the width l of the bag expanded by the moving gripper is the width of the fabric roll, and the height h is the perimeter d of the bag minus twice the width (i.e., h=0.5(d-2l)), thereby ensuring that the rectangular channel after expansion perfectly fits the fabric roll size.

[0081] (4) Edge banding mechanism

[0082] Please refer to Figure 12 The mechanical structure of the flattening and sealing machine 4 is as follows: The flattening and sealing machine 4 is directly connected in series on the conveyor line downstream of the bionic bag opening mechanism 3. It includes a sealing machine moving device 410 and a main body 420 with a sewing machine head mounted on it. The position of the sewing machine head can be adjusted along the X-axis via a guide rail. A forced guide clamping assembly 421 is provided on the feed side of the sewing machine head, which consists of an upper pressure rod 421.1 and a lower pressure rod 421.2 that are parallel to each other. A narrow guide gap of fixed height is formed between the two, and the center line of the guide gap is parallel to the sewing trajectory of the sewing machine head. A bag sensor 421.3 is installed at the front end of the guide gap inlet.

[0083] In this embodiment, the bag sensors are photoelectric sensors, four of which are arranged in a row with their probes pointing downwards. When the woven bag passes under the sensor, the sensor will detect it; when the woven bag has completely passed, the sensor will no longer detect it, indicating that the woven bag has reached its position, and the conveyor line will stop. Because the fabric roll may roll and shift during transportation, and may not be in the middle of the conveyor line, four sensors are used to ensure that the fabric roll is detected.

[0084] Workflow:

[0085] After being filled with fabric, the woven bag moves forward with the conveyor line. The edge of the bag opening is cut into the physical constraint gap formed by the upper pressure bar 421.1 and the lower pressure bar 421.2. The woven bag is wrinkled and flattened by rigid extrusion and is constrained to slide on a fixed height plane.

[0086] When the flattened front edge of the bag opening triggers the bag sensor 421.3, the control system controls the sewing drive motor to start sewing; the bag opening smoothly passes through the machine head under the clamping of the pressure bar; when the tail of the bag opening leaves the sensor detection area, the motor stops and controls the cutter to cut the thread.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the 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 packaging production line for fabric rolls, characterized in that, It includes a main conveyor line arranged along the material conveying direction, i.e., the Y-axis, and a fabric pushing mechanism (1), a bionic bag opening mechanism (3), and a flat sealing mechanism (4) arranged sequentially on the main conveyor line. The production line also includes a bag feeding mechanism (2), which is independently arranged on the side of the feed end of the main conveyor line; The bag supply mechanism (2) can slide and connect with the main conveyor line across the side hopper, and transfer the prefabricated flat woven bag from the side and lay it flat on the working surface of the bionic bag opening mechanism (3) on the main conveyor line; the bionic bag opening mechanism (3) is used to pre-open the flat woven bag with negative pressure from the top and bottom, and after probing into the pre-opening and spreading it outward laterally, it is opened in the vertical direction to form a packaging channel; The fabric pushing mechanism (1) is used to push the fabric roll into the packaging channel; The flattening and sealing mechanism (4) is used to rigidly compress and flatten the opening of the woven bag after it is filled with fabric and then sew it.

2. The automatic packaging production line for spot fabrics as described in claim 1, characterized in that, The bionic bag opening mechanism (3) includes a negative pressure pre-opening component (310) and a bidirectional clamping and supporting bag component (320). The negative pressure pre-opening assembly (310) includes a lower tube suction cup (311) fixedly embedded in the working surface of the main conveyor line, and a lifting suction cup (312) that can be raised and lowered and positioned directly above it; the bidirectional clamping and supporting bag assembly (320) includes an upper moving gripper mechanism (321) and a lower moving gripper mechanism (322); both the upper moving gripper mechanism (321) and the lower moving gripper mechanism (322) are connected to a transverse drive member for driving the gripper to move in opposite directions or backwards in the transverse direction; the upper moving gripper mechanism (321) is also connected to a vertical drive member for driving the gripper to rise and fall in the vertical direction; the front end of the gripper has an upper and lower concave-convex structure, and the gripper is equipped with a cylinder, and the cylinder push rod cooperates with the gripper to form an opening and closing clamping part.

3. The automatic packaging production line for spot fabrics as described in claim 1, characterized in that, The bag supply mechanism (2) includes a bag placement base (210), a lifting platform (220) mounted on the bag placement base (210), a first moving frame (230) located above and driven by a servo motor to slide laterally along the Y-axis, and a suction device (240) mounted on the lower side of the first moving frame; the bottom of the lifting platform (220) is connected to a Z-axis height compensation drive mechanism; the suction device (240) is equipped with a number of downwardly distributed vacuum suction cups, and has a gear and rack transmission mechanism inside for adjusting the lateral and longitudinal spacing between each suction cup.

4. The automatic packaging production line for spot fabrics as described in claim 3, characterized in that, The vacuum suction cup of the bag feeding mechanism (2) has multiple small holes distributed at the bottom in a staggered manner, which converge at the top of the main air intake and are connected to the centrifugal fan. When working, the wind speed of the small holes reaches 3 m / s. A photoelectric sensor for detecting the suction status of the woven bag is provided on the side of the vacuum suction cup.

5. The automatic packaging production line for spot fabrics as described in claim 1, characterized in that, The edge-sealing mechanism (4) includes an edge-sealing machine moving device (410) and a main body (420) with a sewing machine head; the feeding side of the sewing machine head is provided with a forced guide clamping assembly (421), which is composed of an upper pressure rod (421.1) and a lower pressure rod (421.2) that are parallel to each other, forming a narrow guide gap of fixed height between them, and the center line of the guide gap is parallel to the sewing trajectory of the sewing machine head; Four fabric roll detection sensors with downward-facing probes are arranged horizontally side by side above the feed side of the sewing machine head to detect the rolling offset of the fabric roll during the conveying process.

6. A control method for a production line based on any one of claims 1 to 5, characterized in that, Including the biomimetic opening process, specifically: S1: The lower suction cup (311) and the lifting suction cup (312) respectively adsorb the bottom and top layers of the woven bag and separate them outward to form a pre-opening; S2: The bidirectional clamping support bag assembly (320) moves forward, and the left, right, up, and down grippers, in the unclamped state after the cylinder is released, probe into the pre-opening; S3: The horizontal drive components of the upper and lower mechanisms start synchronously, driving the two grippers to move outward to the left and right ends in an unclamped state until the grippers reach the left and right sides of the woven bag, and completely flatten the bag opening in the horizontal direction. S4: After the bag opening is horizontally flattened, the gripper cylinders of the upper and lower mechanisms move synchronously, using the concave and convex structure at the front end to rigidly clamp and lock the flattened bag opening edge. S5: After clamping is completed, the vertical drive component drives the upper moving gripper mechanism to lift vertically, opening the bag opening into a rectangular channel.

7. The control method as described in claim 6, characterized in that, In step S5, the vertical lifting height depends on the built-in support bag size algorithm: the vertical opening height set by the control system is h=0.5×(d-2l); Where h is the vertical lifting height of the upper moving gripper mechanism, l is the width parameter of the fabric roll, and d is the circumference parameter of the woven bag, to ensure that the packaging channel after being stretched out is fully adapted to the size of the fabric roll.

8. The control method as described in claim 6, characterized in that, The working logic of the production line also includes a flattening and sealing step, specifically: four fabric roll detection sensors arranged horizontally on the top of the flattening and sealing mechanism (4) detect the passing woven bags and fabric rolls in real time. When none of the four fabric roll detection sensors detect a signal, it is determined that the fabric roll that has deviated has completely passed through, and the main conveyor line is stopped. At this time, the edge of the bag opening is cut into the guide gap formed by the upper pressure rod (421.1) and the lower pressure rod (421.2) for rigid compression. Then, the sewing machine is started, and the bag opening is smoothly passed through the machine head under the pressure bar to complete the sewing.

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