Flexible coiled material automatic coil changing structure and servo drive coil changing system

Abstract

The invention discloses an automatic roll changing structure for flexible coiled materials and a servo drive roll changing system. The automatic roll changing structure for the flexible coiled materials comprises a first discharging roller, a second discharging roller, a rotating frame, a cutting-off assembly, a joint assembly and a first receiving roller. A working roll is arranged on one of the first discharging roller and the second discharging roller, and a standby roll is arranged on the other one of the first discharging roller and the second discharging roller; the working roll is conveyed towards the first material receiving roller, and a material head of the standby roll is connected to the joint assembly; a cutting-off assembly and a jointing assembly are sequentially arranged in the conveying direction of the working coil; the rotating frame is configured to be driven by a first power source to rotate around a first rotating center. By arranging the rotating frame capable of rotating around the first rotating center, the first discharging roller and the second discharging roller which are arranged in a central symmetry mode complete accurate station switching, the problems of discharging deviation, tension change, coiled material deviation and the like caused by different station positions are effectively avoided, and then the overall quality of coil replacement is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of flexible roll material conveying technology, and in particular to an automatic roll changing structure and servo-driven roll changing system for flexible roll materials. Background Technology

[0002] Flexible roll materials are widely used in automated production fields such as hygiene products and packaging materials. With the continuous improvement of industrial automation, higher requirements are placed on the stability and continuity of the supply of various flexible roll materials. The roll-changing efficiency and quality of flexible roll materials are directly related to the overall product qualification rate of the production line. Taking a sanitary napkin production line as an example, the core raw materials required for its production, such as polyethylene film, release paper, and non-woven fabric surface layer, are all supplied in continuous roll form. In the continuous production process, after a single roll of material is consumed, a roll-changing and material-receiving operation must be carried out in a timely manner. Whether the roll-changing process can be carried out without stopping the machine and whether the roll-changing quality meets the requirements not only affects production efficiency but also easily affects the processing quality of subsequent products.

[0003] Existing flexible roll changing structures typically employ two unwinding shafts, achieving continuous roll changing without shutting down the machine through automatic roll changing: when the roll on one unwinding shaft is about to run out, an automatic splicing mechanism splices and fixes the new roll head to the old roll tail, ensuring continuous roll supply. However, due to structural layout limitations, the two unwinding shafts cannot be in the same working position, and the roll conveying path, feeding angle, and tension transmission path corresponding to unwinding shafts located at different stations all have inherent differences. Sanitary napkin production requires a large amount of materials such as polyethylene film, release paper, and non-woven fabric surface layers. These materials are flexible, ultra-thin materials highly sensitive to tension fluctuations, positional deviations, and conveying angles. Conveying deviations caused by different stations directly lead to problems such as stretching deformation, wrinkling, and conveying deviation in these ultra-thin flexible rolls, easily affecting the stability of subsequent processing steps, and in severe cases, causing production line shutdowns and increasing product defect rates. Therefore, there is an urgent need to design an automatic flexible roll changing structure and a corresponding servo-driven roll changing system. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic flexible roll changing structure and a servo-driven roll changing system to solve the problem of flexible roll conveying deviation and affecting roll changing quality caused by differences in workstations during roll changing in existing roll changing mechanisms.

[0005] To achieve this objective, the present invention adopts the following technical solution: An automatic roll-changing structure for flexible roll materials includes a first unloading roller, a second unloading roller, a rotating frame, a cutting assembly, a joining assembly, and a first receiving roller. One of the first and second feeding rollers is provided with a working roll, and the other of the first and second feeding rollers is provided with a spare roll; the working roll is conveyed toward the first receiving roller, and the head of the spare roll is connected to the coupling assembly; Along the conveying direction of the working roll, a cutting component and a joining component are provided in sequence. The joining component is used to join the material head of the spare roll with the material tail of the working roll when changing rolls. The cutting component is used to cut off the material tail of the joined working roll when changing rolls. The rotating frame is configured to be driven by a first power source to rotate around a first rotation center; the first feeding roller and the second feeding roller are rotatably mounted on the rotating frame, and the first feeding roller and the second feeding roller are arranged in a centrally symmetrical manner around the first rotation center.

[0006] Furthermore, it also includes: The reference plate is fixedly connected to the rotating frame; The first center wheel is coaxial with and rotatably connected to the first feeding roller; The second center wheel is coaxial with and rotatably connected to the second feeding roller; An adjusting roller is adjustablely mounted on the rotating frame; The constraint loop passes sequentially around the first center wheel, the adjusting roller, the reference plate, and the second center wheel to form a closed loop.

[0007] Furthermore, a first extension arm and a second extension arm are fixed on the rotating frame. The first extension arm and the second extension arm are arranged symmetrically around the first rotation center and correspond to the first feeding roller and the second feeding roller, respectively. Furthermore, the distance between the end of the first extension arm and the center of the first feed roller, and the distance between the end of the second extension arm and the center of the second feed roller, are both greater than the maximum radius of the working roll and / or the spare roll.

[0008] Furthermore, one of the corresponding work rolls in the first extension arm and the second extension arm extends toward the cutting assembly; Both the first and second extension arms have auxiliary wheels rotatably connected to their ends.

[0009] Furthermore, it also includes a material storage assembly located downstream of the first receiving roller along the flexible roll conveying direction; The flexible roll material is conveyed in a zigzag pattern within the storage assembly; Along the conveying direction of the flexible roll material, a second receiving roller is provided between the material storage assembly and the first receiving roller.

[0010] Furthermore, it also includes mounting plates; The joining assembly includes a first joining member, a second joining member fixed to the mounting plate, and a second power source fixed to the mounting plate. The first joining member is driven by the second power source to move closer to or away from the second joining member.

[0011] Furthermore, the cutting assembly includes a tool holder mounted on a mounting plate, a third power source mounted on the tool holder, and a cutter mounted on the output end of the third power source. A first through hole is provided on the tool holder facing the cutter.

[0012] Furthermore, along the conveying direction of the work roll, a first guide roller is fixed on the mounting plate; the first guide roller is provided with an arc-shaped guide surface; the first guide roller is provided with a second through hole that radially penetrates the arc-shaped guide surface, and the second through hole is positioned opposite the first through hole; The mounting plate is provided with a second guide roller for guiding the spare roll to the engagement assembly.

[0013] Furthermore, the working roll conveying directions on both sides of the arc guide surface of the first guide roller are not in a straight line; the cutter, the first through hole and the second through hole are all inclined and are directly opposite the center of the arc direction of the arc guide surface.

[0014] A servo-driven roll changing system includes sensors, a servo control unit, and an automatic roll changing structure for the flexible roll material. The sensor is used to detect the remaining amount of flexible roll material on the working roll; The servo control unit is signal-connected to the sensor, the first power source, the cutting component, and the joining component, and is used to control the first power source, the cutting component, and the joining component to operate according to the sensor signal in order to complete the roll changing operation.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The flexible roll-to-roll automatic structure provided by this invention achieves the joining of spare rolls and working rolls, as well as the cutting of old working rolls, by setting up a joining component and a cutting component. A rotating frame that can rotate around a first rotation center allows the centrally symmetrically arranged first and second feed rollers to achieve precise switching of workstations, ensuring a constant roll conveying position and path after roll changing. This effectively avoids problems such as output deviation, tension changes, and roll misalignment caused by different workstation positions, ensuring continuous and stable conveying, and thus guaranteeing the overall quality of roll changing. Furthermore, since the working roll used for each operation is in the same position, only one cutting component is needed, and the joining component only requires one unidirectional drive, eliminating the need for bidirectional drive, significantly simplifying the overall structural layout of the equipment. This structure is particularly suitable for processing flexible ultra-thin materials such as polyethylene film, release paper, and non-woven fabric surfaces, which are highly sensitive to tension fluctuations, positional deviations, and conveying angles. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0018] Figure 1 This is a schematic diagram of the automatic roll-changing structure for flexible roll materials in this invention. The arrows in the diagram indicate the rotation direction of the rotating frame. Figure 2 This is a schematic diagram of the structure of the first feeding roller, the second feeding roller, and the rotating frame in this invention. The arrows in the diagram indicate the rotation direction of the rotating frame. Figure 3 This is a schematic diagram of the rotating frame structure in this invention; Figure 4 This is a schematic diagram of the reference disk, the first center wheel, the second center wheel, the adjusting roller, and the constraint loop in this invention; Figure 5 This is a schematic diagram of the cutting component, joining component, and mounting plate in this invention; Figure 6 This is a schematic diagram of the cutting assembly and the first guide roller in this invention; Figure 7 This is a schematic diagram of the joining components in this invention.

[0019] Illustration: 11. First feed roller; 12. Second feed roller; 2. Rotating frame; 21. Reference plate; 22. First center wheel; 23. Second center wheel; 24. Adjusting roller; 25. Constraint loop; 26. First extension arm; 27. Second extension arm; 28. Auxiliary wheel; 3. Cutting assembly; 31. Tool holder; 311. First through hole; 32. Third power source; 33. Cutting blade; 4. Joining assembly; 41. First joining member; 42. Second joining member; 43. Second power source; 51. First receiving roller; 52. Second receiving roller; 6. Material storage components; 7. Mounting plate; 71. First guide roller; 711. Arc guide surface; 712. Second through hole; 72. Second guide roller; 100. Working volume; 200. Spare volume. Detailed Implementation

[0020] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1: This embodiment provides an automatic roll-changing structure for flexible roll materials, enabling non-stop roll-changing during continuous production, ensuring the continuity and stability of the roll material conveying process. Combined with... Figure 1 As shown, the automatic flexible roll changing structure includes a first feed roller 11, a second feed roller 12, a rotating frame 2, a cutting assembly 3, a joining assembly 4, and a first receiving roller 51. One of the first feed rollers 11 and 12 has a working roll 100, and the other has a spare roll 200. It should be noted that the working roll 100 is the flexible roll currently being fed out and continuously conveyed; the spare roll 200 is the flexible roll in a standby state, waiting to be switched to. After the roll changing operation is completed, the spare roll 200 is switched to the new working roll 100, taking over the feeding and conveying of the original roll. The working roll 100 is conveyed towards the first receiving roller 51, providing a stable and continuous supply of roll material for subsequent production processes; the head of the spare roll 200 is connected to the joining assembly 4, preparing for roll changing and joining.

[0024] Along the conveying direction of the working roll 100, a cutting assembly 3 and a joining assembly 4 are sequentially arranged. The joining assembly 4 is used to join the head of the spare roll 200 with the tail of the working roll 100 during roll changing, realizing the connection between the two new and old rolls, ensuring uninterrupted roll conveying. The cutting assembly 3 is used to cut off the tail of the joined working roll 100 during roll changing, completing the termination action of the original working roll 100. After the joining is completed and the roll changing is realized, the original spare roll 200 continues to be conveyed as the new working roll 100.

[0025] The rotating frame 2 is configured to rotate around a first rotation center driven by a first power source; the first feeding roller 11 and the second feeding roller 12 are rotatably mounted on the rotating frame 2, and the first feeding roller 11 and the second feeding roller 12 are centrally symmetrically arranged around the first rotation center. Figures 2-3 As shown, when the rotating frame 2 rotates around the first rotation center, it can drive the first unloading roller 11 and the second unloading roller 12 to switch between the working position and the standby position. The working position is the position of the unloading roller corresponding to the working roll 100, and the standby position is the position of the unloading roller corresponding to the standby roll 200. Through a centrally symmetrical arrangement, it is ensured that after the original standby roll 200 becomes the new working roll 100, it can switch to the working position. This allows both the first unloading roller 11 and the second unloading roller 12 to accurately reach their respective original positions after switching, ensuring that the conveying path, docking angle, and guiding reference of the roll material remain constant after switching, thereby guaranteeing the accuracy of the roll change.

[0026] In practice, when a roll change is required, the engagement component 4 operates to precisely fit and press the head of the spare roll 200 with the tail of the current working roll 100, thus completing the reliable engagement of the two new and old rolls, the spare roll 200 and the working roll 100. After the engagement is completed, the cutting component 3 operates to cut off the tail of the original working roll 100, terminating the feeding of the original working roll 100. Subsequently, the rotating frame 2 rotates around the first rotation center, driving the first feeding roller 11 and the second feeding roller 12 to switch positions synchronously. Since the two are arranged in a centrally symmetrical manner, the feeding roller where the original spare roll 200 is located will move precisely to the working position where the original working roll 100 is located, while the feeding roller where the original working roll 100 is located will move to the material preparation position where the original spare roll 200 is located. After the roll change is completed, the original spare roll 200 officially becomes the new working roll 100, continuously feeding the roll to the subsequent processes at the working position. This process design ensures that the installation position and conveying path of the new working roll 100 are completely consistent with the original working roll 100 after roll replacement. Structurally, it avoids problems such as discharge path deviation, feed angle misalignment, tension abrupt changes, and roll misalignment caused by the different initial positions of the working roll 100 and the spare roll 200. This ensures the continuity and stability of roll conveying and reduces the product defect rate in subsequent processing. In addition, since the working roll 100 used for each operation is in the same position, only one cutting component 3 is required, and the joining component 4 only requires one unidirectional drive engagement, eliminating the need for bidirectional drive engagement. This significantly simplifies the overall structural layout of the equipment, reduces the number of parts and assembly difficulty, and lowers equipment manufacturing costs. A single cutting assembly 3 can meet the needs of roll changing and cutting, eliminating the need to set up cutting components at two separate workstations and avoiding the positioning deviation problem of multiple assemblies. The joining assembly 4 adopts a unidirectional drive design, eliminating the need for additional reverse drive structure. This simple drive form is more suitable for joining assemblies 4 that require additional auxiliary pressing structures, such as ultrasonic joining and hot pressing. It can avoid the overall structure being too complicated and reduce layout conflicts with special components such as ultrasonic generators and hot pressing heads.

[0027] Furthermore, the automatic flexible roll-to-roll structure described in this embodiment is particularly suitable for flexible ultra-thin materials such as polyethylene film, release paper, and non-woven fabric layers, which are highly sensitive to tension fluctuations, positional deviations, and conveying angles. In roll-to-roll operations for these flexible ultra-thin materials, the automatic flexible roll-to-roll structure described in this embodiment can avoid problems such as roll stretching, wrinkling, oblique joints, and conveying deviations caused by sudden path changes and angle deviations, ensuring the quality of flexible roll joints and the accuracy of subsequent processing steps.

[0028] The automatic roll-changing structure for flexible roll materials described in this embodiment also includes a reference disk 21, a first center wheel 22, a second center wheel 23, an adjusting roller 24, and a constraint ring 25. Combined with... Figures 3-4As shown, the reference disk 21 is fixedly connected to the rotating frame 2, and the center of the reference disk 21 coincides with the first rotation center. The reference disk 21 serves as the constraint reference for the constraint loop 25, providing a stable fulcrum for the constraint loop 25. The first center wheel 22 is coaxial and rotatably connected to the first feeding roller 11. The second center wheel 23 is coaxial and rotatably connected to the second feeding roller 12. The adjusting roller 24 is adjustablely mounted on the rotating frame 2. In a specific embodiment, at least one of the adjusting roller 24 and the rotating frame 2 is provided with an adjusting groove, and the adjusting roller 24 is adjustable by connecting different positions of the adjusting groove with threaded fasteners. In other embodiments, a slider and slide rail locking structure can be used to achieve the adjustable mounting of the adjusting roller 24. The constraint loop 25 sequentially passes through the first center wheel 22, the adjusting roller 24, the reference disk 21, and the second center wheel 23 to form a closed loop.

[0029] In practice, during the roll changing process, the rotating frame 2 revolves around the first rotation center, driving the first feed roller 11, the second feed roller 12, and the adjusting roller 24 to move synchronously. The constraint loop 25, passing through the first center wheel 22 and the second center wheel 23, provides a certain circumferential constraint for the two first feed rollers 11 and the second feed roller 12, counteracting the circumferential movement and swaying of the first feed rollers 11 and the second feed roller 12 caused by the shaft hole clearance. In particular, during the process of the rotating frame 2 driving the first feed roller 11 and the second feed roller 12 to change positions, while the first feed roller 11 and the second feed roller 12 revolve with the rotating frame 2, the direction of the shaft hole clearance between themselves and the mounting hole of the rotating frame 2 will change synchronously with the rotation angle. The gap offset direction on one side will gradually reverse as the work station changes. The first feeding roller 11 and the second feeding roller 12 are prone to momentary swaying and posture deviation due to the dynamic change of the gap direction, which affects the stable conveying of the flexible roll material. The constraint loop 25 forms a dynamically adapted circumferential constraint through closed-loop tension, which always fits the surface of the first center wheel 22 and the second center wheel 23. It can offset the unstable factors caused by the change of the gap direction in real time, suppress the jumping and swaying of the feeding roller during the work station switching process, and ensure that the feeding roller always maintains a stable posture when the position is changed. Meanwhile, the reference plate 21 can serve as the constraint reference for the constraint loop 25, providing a stable fulcrum for the constraint loop 25 and thus enhancing the constraint effect. The tension of the constraint loop 25 can also be changed by adjusting the installation position of the adjusting roller 24, thereby adjusting the magnitude of the circumferential constraint force on the first center wheel 22 and the second center wheel 23. In addition, the constraint loop 25 only provides circumferential constraint and does not transmit power. When not changing rolls, the working roll 100 is pulled and rotated by the flexible roll material at the front end. The first center wheel 22 / second center wheel 23 will not rotate with the working roll 100 / standby roll 200, that is, it will not drive the standby roll 200 to rotate, ensuring that the standby roll 200 is always in a standby state.

[0030] The rotating frame 2 is fixed with a first extension arm 26 and a second extension arm 27. The first extension arm 26 and the second extension arm 27 are centrally symmetrically arranged around a first rotation center and correspond to the first feed roller 11 and the second feed roller 12, respectively. The distance between the end of the first extension arm 26 and the center of the first feed roller 11, and the distance between the end of the second extension arm 27 and the center of the second feed roller 12, are both greater than the maximum radius of the working roll 100 and / or the spare roll 200, preventing motion interference between the ends of the first extension arm 26 / second extension arm 27 and the working roll 100 / spare roll 200. One of the first extension arms 26 and the second extension arm 27, corresponding to the working roll 100, extends towards the cutting assembly 3, providing auxiliary guidance and limiting for the conveying path of the working roll 100. The ends of both the first extension arm 26 and the second extension arm 27 are rotatably connected to auxiliary wheels 28, which can rotate freely with the roll material conveying, reducing frictional resistance during roll material conveying; the auxiliary wheel 28 corresponding to the working roll 100 is used to guide the working roll 100. In this embodiment, the rotating frame 2 rotates clockwise, so that the first extension arm 26 and the second extension arm 27 can take turns at the work position. One of them rotates to the work position to receive and guide the work roll 100, and completes the work switch with the other. During this process, there will be no interference with the conveying of the flexible roll material.

[0031] The automatic flexible roll changing structure described in this embodiment also includes a storage component 6 located downstream of the first receiving roller 51 along the flexible roll conveying direction. This storage component 6 temporarily stores a certain amount of flexible roll material during the changing operation to compensate for the difference in flexible roll material conveying during the changing process. In a specific embodiment, the flexible roll material is conveyed in a zigzag pattern within the storage component 6, increasing the storage capacity within a limited space and ensuring a continued supply of flexible roll material to downstream processes during the changing operation. Along the flexible roll conveying direction, a second receiving roller 52 is provided between the storage component 6 and the first receiving roller 51. The second receiving roller 52 further guides and tensions the flexible roll material, allowing it to smoothly enter the storage component 6.

[0032] In practice, during the roll changing process, during the entire cycle of the joining assembly 4 completing the pressing of the material head of the spare roll 200 and the material tail of the working roll 100, the cutting assembly 3 cutting off the material tail of the original working roll 100, and the rotating frame 2 completing the station switching, the material storage assembly 6 will continuously release the internally stored flexible roll material. On the one hand, it provides stable material supply to the downstream process, and on the other hand, it buffers the tension fluctuations generated during the roll changing process, avoiding the unstable state caused by the roll changing action from being directly transmitted to the downstream process.

[0033] The automatic roll-changing structure for flexible roll materials described in this embodiment also includes a mounting plate 7; combined with Figure 5 As shown, both the joining assembly 4 and the cutting assembly 3 are mounted on the mounting plate 7. Figure 7As shown, the joining assembly 4 includes a first joining member 41, a second joining member 42 fixed on the mounting plate 7, and a second power source 43 fixed on the mounting plate 7. The first joining member 41 is driven by the second power source 43 to move closer to or away from the second joining member 42. The first joining member 41 has a first position and a second position: when the first joining member 41 is in the first position, the first joining member 41 does not contact the drive roll, reserving space for the normal conveying of the work roll 100 and preventing interference with the conveying of the flexible roll material; when the first joining member 41 is in the second position, the first joining member 41 and the second joining member 42 contact and press together, so as to achieve the mutual engagement of the material head of the spare roll 200 and the material tail of the work roll 100 when changing rolls. In a specific embodiment, the joining assembly 4 adopts one of the following methods: hot pressing, ultrasonic pressing, and adhesive pressing, to achieve a firm engagement between the material tail of the work roll 100 and the material head of the spare roll 200. The mounting plate 7 is provided with a second guide roller 72 for guiding the spare roll 200 to the joining assembly 4. In a specific embodiment, the second power source 43 is one of a cylinder, an electric cylinder, or a hydraulic cylinder; it should be noted that any power element that can output linear motion and meet the requirements of engagement can be used as the second power source 43 in this embodiment.

[0034] Combination Figure 6As shown, the cutting assembly 3 includes a blade holder 31 mounted on a mounting plate 7, a third power source 32 mounted on the blade holder 31, and a cutter 33 mounted on the output end of the third power source 32. A first through hole 311 is provided on the blade holder 31 directly opposite the cutter 33, allowing the cutter 33 to move around the blade. Along the conveying direction of the work roll 100, a first guide roller 71 is fixed on the mounting plate 7. The first guide roller 71 has an arc-shaped guide surface 711 for guiding the conveying of the work roll 100. A second through hole 712 is provided on the first guide roller 71, radially penetrating the arc-shaped guide surface 711. The second through hole 712 is positioned directly opposite the first through hole 311, allowing the cutter 33 to pass through the first through hole 311 and the second through hole 712 sequentially to cut the work roll 100. In a specific embodiment, the cutting assembly 3 is mounted on the first guide roller 71. The conveying directions of the work rolls 100 on both sides of the arc guide surface 711 of the first guide roller 71 are not in a straight line. That is, the arc guide surface 711 of the first guide roller 71 is located at the corner of the conveying direction of the work roll 100, and the work roll 100 is in close contact with the arc guide surface 711 at this position. The cutter 33, the first through hole 311, and the second through hole 712 are all inclined and directly opposite the center of the arc direction of the arc guide surface 711, so that the flexible roll material is cut in a highly contacted state, the cut is flat and neat, and the cutting quality and stability are improved. In a specific embodiment, the third power source 32 is one of a cylinder, an electric cylinder, or a hydraulic cylinder. It should be noted that any power element that can output linear motion and meet the cutting action requirements of the cutter 33 can be used as the third power source 32 in this embodiment.

[0035] In practice, when a roll change is required, the second power source 43 drives the first coupling member 41 to move from the first position to the second position, so that the first coupling member 41 and the second coupling member 42 press against each other, stably joining the material head of the spare roll 200 with the material tail of the working roll 100; the second guide roller 72 guides the material head of the spare roll 200 to the joining area in advance to ensure accurate joining position; after joining is completed, the third power source 32 drives the cutter 33 to move, and the cutter 33 passes through the first through hole 311 of the cutter holder 31 and the second through hole 712 of the first guide roller 71 in sequence. Utilizing the adhesion and limiting effect of the arc guide surface 711 of the first guide roller 71 on the flexible roll material, the flexible roll material is cut smoothly. The inclined cutter 33 cooperates with the through hole to make the cut of the flexible roll material flat and burr-free; the joining and cutting actions are executed sequentially and continuously, the overall structure is compact, and the roll changing efficiency is effectively improved.

[0036] The automatic roll-changing structure for flexible rolls provided in this embodiment achieves the joining of the spare roll 200 and the working roll 100, and the cutting of the old working roll 100, by setting up a joining component 4 and a cutting component 3. A rotating frame 2, which can rotate around a first rotation center, allows the centrally symmetrically arranged first and second feed rollers 11 and 12 to accurately switch positions, ensuring that the roll's conveying position and path remain constant after roll changing. This effectively avoids problems such as discharge deviation, tension changes, and roll misalignment caused by different workstation positions, ensuring continuous and stable conveying. Furthermore, since the working roll 100 used for each operation is in the same position, only one cutting component 3 is needed, and the joining component 4 only requires one unidirectional drive joining, eliminating the need for bidirectional drive joining, significantly simplifying the overall structural layout of the equipment. This structure is particularly suitable for processing flexible ultra-thin materials such as polyethylene film, release paper, and non-woven fabric surfaces, which are highly sensitive to tension fluctuations, positional offsets, and conveying angles.

[0037] Example 2: This embodiment provides a servo-driven roll changing system, which automates and refines the entire roll changing process through servo control, improving the accuracy and reliability of the roll changing operation. The servo-driven roll changing system includes a sensor, a servo control unit, and the automatic flexible roll changing structure described in Embodiment 1. The sensor detects the remaining amount of flexible roll material on the work roll 100; the servo control unit is signal-connected to the sensor, the first power source, the cutting component 3, and the joining component 4, and controls the operation of the first power source, the cutting component 3, and the joining component 4 based on the sensor signals to complete the roll changing operation.

[0038] The servo-driven roll changing system provided in this embodiment achieves coordinated operation of various execution components through precise control of the servo control unit, and automates the entire process from margin monitoring, station switching, flexible roll splicing, and cutting.

[0039] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flexible web automatic roll changing structure, characterized in that: It includes a first feeding roller (11), a second feeding roller (12), a rotating frame (2), a cutting assembly (3), a joining assembly (4), and a first receiving roller (51). One of the first feeding roller (11) and the second feeding roller (12) is provided with a working roll (100), and the other of the first feeding roller (11) and the second feeding roller (12) is provided with a spare roll (200); the working roll (100) is conveyed toward the first receiving roller (51), and the head of the spare roll (200) is connected to the joining assembly (4); Along the conveying direction of the working roll (100), a cutting component (3) and a joining component (4) are provided in sequence. The joining component (4) is used to join the material head of the spare roll (200) with the material tail of the working roll (100) when changing rolls. The cutting component (3) is used to cut off the material tail of the joined working roll (100) when changing rolls. The rotating frame (2) is configured to be driven by a first power source to rotate around a first rotation center; the first feeding roller (11) and the second feeding roller (12) are rotatably mounted on the rotating frame (2), and the first feeding roller (11) and the second feeding roller (12) are arranged in a centrally symmetrical manner around the first rotation center.

2. The automatic roll-changing structure for flexible rolled materials according to claim 1, characterized in that: Also includes: The reference plate (21) is fixedly connected to the rotating frame (2); The first center wheel (22) is coaxial with and rotatably connected to the first feeding roller (11); The second center wheel (23) is coaxial with and rotatably connected to the second feeding roller (12); Adjusting roller (24) is adjustablely mounted on rotating frame (2); The constraint loop (25) passes sequentially around the first center wheel (22), the adjusting roller (24), the reference plate (21), and the second center wheel (23) to form a closed loop.

3. The automatic roll-changing structure for flexible roll materials according to claim 1, characterized in that: The rotating frame (2) is fixed with a first extension arm (26) and a second extension arm (27). The first extension arm (26) and the second extension arm (27) are arranged symmetrically around the first rotation center and correspond to the first feeding roller (11) and the second feeding roller (12) respectively. Furthermore, the distance between the end of the first extension arm (26) and the center of the first feed roller (11), and the distance between the end of the second extension arm (27) and the center of the second feed roller (12) are both greater than the maximum radius of the working roll (100) and / or the spare roll (200).

4. The automatic roll-changing structure for flexible roll materials according to claim 3, characterized in that: One of the first extension arm (26) and the second extension arm (27) corresponding to the work roll (100) extends toward the cutting assembly (3); The first extension arm (26) and the second extension arm (27) are both rotatably connected to auxiliary wheels (28).

5. The automatic roll-changing structure for flexible rolled materials according to claim 1, characterized in that: It also includes a material storage assembly (6) located downstream of the first receiving roller (51) along the flexible roll conveying direction. The flexible roll material is conveyed in a zigzag pattern within the storage assembly (6); Along the flexible roll conveying direction, a second receiving roller (52) is provided between the material storage assembly (6) and the first receiving roller (51).

6. The automatic roll-changing structure for flexible rolled materials according to claim 1, characterized in that: It also includes the mounting plate (7); The joining assembly (4) includes a first joining member (41), a second joining member (42) fixed on the mounting plate (7), and a second power source (43) fixed on the mounting plate (7). The first joining member (41) is driven by the second power source (43) to move closer to or away from the second joining member (42).

7. The automatic roll-changing structure for flexible rolled materials according to claim 6, characterized in that: The cutting assembly (3) includes a knife holder (31) mounted on a mounting plate (7), a third power source (32) mounted on the knife holder (31), and a cutter (33) mounted on the output end of the third power source (32). A first through hole (311) is provided on the knife holder (31) facing the cutter (33).

8. The automatic roll-changing structure for flexible rolls according to claim 7, characterized in that: Along the conveying direction of the work roll (100), a first guide roller (71) is fixed on the mounting plate (7); the first guide roller (71) is provided with an arc guide surface (711); the first guide roller (71) is provided with a second through hole (712) that radially penetrates the arc guide surface (711), and the second through hole (712) is positioned opposite to the first through hole (311); The mounting plate (7) is provided with a second guide roller (72) for guiding the spare roll (200) to the engagement assembly (4).

9. The automatic roll-changing structure for flexible roll materials according to claim 8, characterized in that: The conveying directions of the work rolls (100) on both sides of the arc guide surface (711) of the first guide roller (71) are not in a straight line; the cutter (33), the first through hole (311) and the second through hole (712) are all inclined and are directly opposite the center of the arc direction of the arc guide surface (711).

10. A servo-driven roll changing system, characterized in that: Includes sensors, a servo control unit, and the automatic roll-changing structure for flexible rolls as described in any one of claims 1-9. The sensor is used to detect the remaining amount of flexible roll material on the work roll (100); The servo control unit is connected to the sensor, the first power source, the cutting component (3), and the joining component (4) by signal connection, and is used to control the first power source, the cutting component (3), and the joining component (4) to perform the roll changing operation according to the sensor signal.

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