Paper core chuck device and rewinder
The piston-driven replaceable claw disc structure solves the automation problem of the paper core clamping device, realizes efficient and precise paper core clamping and disassembly, improves the production efficiency and quality of rewinding machines, and promotes the intelligent development of the paper industry.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO ASIA PULP & PAPER
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-12
AI Technical Summary
Existing paper core clamping devices rely on manual operation, resulting in low efficiency and unstable accuracy. They are difficult to adapt to the high-efficiency automation requirements of high-speed rewinding machines. Furthermore, traditional clamping structures are complex, have high maintenance costs, and cannot achieve adaptive adjustment.
It adopts a piston-driven replaceable claw plate structure, which pneumatically controls the expansion and contraction of the claw plate to achieve automated paper core installation and removal, adapting to the clamping of different paper core specifications. Combined with the design of telescopic spring and return spring, it achieves precise clamping and adaptive adjustment.
It achieves high efficiency and precise clamping of automated paper core installation, reduces roll changing time and labor intensity, improves equipment utilization and paper roll quality, reduces paper core loss and cost, and promotes the intelligent development of rewinders.
Smart Images
Figure CN224350010U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of paper rewinding equipment, specifically to a paper core clamping device and a rewinding machine. Background Technology
[0002] Rewinders are indispensable downstream processing equipment in the paper industry, primarily used to slit and rewind raw paper into finished paper rolls that meet customer requirements. Their core function is to ensure the flatness, tightness, and end-face consistency of the paper rolls through precise control of tension, speed, and slitting accuracy, directly impacting the quality of the finished paper and the efficiency of subsequent processing. During the rewinding process, the stable fixing of the paper core (the tubular carrier supporting the paper roll) is crucial, and the paper core chuck, as one of the core components of the rewinder, is responsible for clamping and releasing the paper core, ensuring its coaxiality and synchronous rotation with the rewinding shaft. Traditional paper core chucks mostly employ mechanical locking or pneumatic clamping structures, operated manually or semi-automatically. The clamping force relies on operator experience, resulting in low efficiency and unstable accuracy. With the widespread adoption of high-speed, wide-width rewinders, the reliability and automation level of the paper core chuck have an increasingly significant impact on production efficiency.
[0003] Currently, most paper core chuck devices in the papermaking industry are still primarily operated manually, or only partially semi-automated. Operators need to frequently adjust the chuck position and manually tighten the paper core, resulting in long roll changeover times, high labor intensity, and susceptibility to human error causing paper core misalignment or uneven clamping force, leading to quality problems such as loose paper rolls and uneven end faces. Furthermore, traditional chuck structures are complex, have high maintenance costs, and are difficult to adapt to the rapid switching requirements of different paper core sizes and materials. Especially in high-speed rewinding scenarios, manual intervention can easily lead to production interruptions and reduced equipment utilization. While existing pneumatic chucks can partially improve efficiency, their insufficient air pressure stability, slow response speed, and lack of adaptive adjustment capabilities make them unable to meet the demands of intelligent production, becoming a bottleneck restricting the overall performance improvement of rewinders.
[0004] Despite recent attempts to introduce automated gripper technology, the industry still faces numerous unresolved challenges. For example, automated grippers generally rely on rigid mechanical structures, making them sensitive to paper core dimensional tolerances and prone to clamping failure due to slight deformation. Existing grippers lack dynamic compensation capabilities, failing to adapt in real-time to the centrifugal force or thermal expansion deformation of the paper core during high-speed rotation, leading to loosening or overload wear. These common problems make it difficult for existing automation solutions to achieve a balance between stability, economy, and adaptability, hindering their widespread adoption by paper manufacturers. Utility Model Content
[0005] A first aspect of this application provides a paper core clamping device, the paper core clamping device comprising:
[0006] A slide rail, wherein the slide rail is provided with multiple sliding mating pairs;
[0007] Multiple claw discs are provided, each corresponding to one of the sliding mating pairs, and can slide along the sliding mating pairs;
[0008] A piston is positioned at the center of the plurality of claw discs and is used to drive the plurality of claw discs to move in a direction away from each other, thereby causing the plurality of claw discs to expand to clamp the paper core.
[0009] In some optional embodiments, the slide rail disk is provided with multiple radially arranged slide grooves, and the claw disk is provided with slide rails, the slide rails and the slide grooves cooperating to form the sliding mating pair.
[0010] In some alternative embodiments, the piston is provided with a conical structure, and the claw disc is provided with a mating inclined surface on the side facing the piston. The conical structure engages with the mating inclined surface, thereby driving the claw disc to expand and move in a direction perpendicular to the piston's moving direction.
[0011] In some optional embodiments, the paper core clamping device further includes multiple telescopic springs, each connected to the slide rail, and the telescopic springs are arranged in a one-to-one correspondence with the claw plates and hold the claw plates to drive the claw plates to reset.
[0012] In some optional embodiments, the paper core clamping device further includes a clamping connecting plate and a cylinder. The cylinder is fixedly connected to the clamping connecting plate and the slide rail plate respectively and surrounds a sealed cavity. The piston is disposed in the sealed cavity. The clamping connecting plate is provided with an air inlet channel, through which high-pressure gas is introduced into the sealed cavity, thereby driving the piston to move along the sealed cavity.
[0013] In some optional embodiments, the paper core clamping device further includes a return spring disposed within the sealed cavity, the two ends of the return spring respectively supporting the piston and the slide rail plate, for driving the piston to return to its original position.
[0014] In some optional embodiments, a sliding seal is provided on the outer wall of the piston that mates with the cylinder to achieve a sliding seal between the piston and the cylinder.
[0015] In some optional embodiments, the paper core clamping device further includes a guide rod, one end of which is fixedly connected to the piston, and the other end is inserted into the guide hole of the slide rail plate to guide the movement of the piston.
[0016] In some optional embodiments, the paper core clamping device further includes a cylinder sleeve and a plurality of spring fixing plates, wherein the plurality of spring fixing plates are arranged one-to-one with the telescopic springs and are respectively fixedly connected to the slide rail plate, and the telescopic springs are fixedly connected to the spring fixing plates; the cylinder sleeve is sleeved on the outer periphery of the slide rail plate and covers the spring fixing plates.
[0017] Secondly, embodiments of this application provide a rewinding machine, which includes the paper core clamping device described in the above embodiments.
[0018] The paper core clamping device provided in this application adopts a piston and a replaceable claw plate. By controlling the movement of the piston, the claw plate is driven to fix the paper core. At the same time, the replaceable claw plate size can realize the winding operation of various paper cores according to different specifications of paper cores. It fundamentally solves the problem of manual installation and replacement of paper core clamps and realizes the problem of automated paper core installation, fixing and disassembly. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the paper core clamping device of this application;
[0021] Figure 2 yes Figure 1 A frontal perspective view of the paper core clamping device in the embodiment;
[0022] Figure 3 yes Figure 1 A schematic diagram of the slide rail disk in the embodiment;
[0023] Figure 4 yes Figure 3 A top view of the slide rail structure in the embodiment;
[0024] Figure 5 yes Figure 1 A schematic diagram of the claw disk structure in the embodiment;
[0025] Figure 6 yes Figure 5 A top view of the claw disk in the embodiment;
[0026] Figure 7 yes Figure 1 A schematic diagram of the piston structure in the embodiment;
[0027] Figure 8 yes Figure 1 A schematic diagram of the cylinder block in the embodiment. Detailed Implementation
[0028] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.
[0029] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.
[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0031] Conventional paper core clamping devices still rely heavily on manual operation, resulting in long roll change times, high labor intensity, reduced equipment utilization, and problems such as paper core misalignment or uneven clamping force causing loose paper rolls and uneven end faces. To address these issues, this application provides an automatic paper core clamping device.
[0032] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the paper core clamping device of this application. Figure 2 yes Figure 1 A frontal perspective view of the paper core clamping device in this embodiment; the paper core clamping device in this embodiment includes, but is not limited to, the following structures: slide rail 101, multiple claw plates 102, and piston 103.
[0033] For details, please refer to the following: Figures 3 to 7 , Figure 3 yes Figure 1 A schematic diagram of the slide rail disk in the embodiment. Figure 4 yes Figure 3 A top view of the slide rail structure in the embodiment. Figure 5 yes Figure 1 A schematic diagram of the claw disk in the embodiment. Figure 6 yes Figure 5 A top view of the claw disk in the embodiment; Figure 7 yes Figure 1 The embodiment shows a schematic diagram of the piston structure; wherein, the slide rail disk 101 is provided with multiple sliding mating pairs, and multiple claw disks 102 are arranged one-to-one with the sliding mating pairs and can slide along the sliding mating pairs.
[0034] Optionally, in this embodiment, six claw disks 102 are described. The slide rail disk 101 is provided with multiple radially arranged slide grooves 1011, wherein the slide grooves 1011 can be T-shaped grooves. The claw disk 102 is provided with slide rails 1021, which can be T-shaped slide rails. The slide rails 1021 and the slide grooves 1011 cooperate to form a sliding fit pair.
[0035] Please continue reading. Figure 1 The piston 103 is positioned at the center of multiple claw discs 102, driving them to move away from each other (arrow X in the figure), thereby expanding the claw discs 102 to clamp the paper core. The end of the claw disc 102 furthest from the piston 103 is inserted into the paper core and expands under the drive of the piston 103, pressing against the inner wall of the paper core to clamp it. The end of the claw disc 102 furthest from the piston 103 is equipped with a detachable expansion block 1023. This end can have various sizes and models, allowing for interchangeable use depending on the paper core, thus enabling the paper core clamping device in this embodiment to be adaptable to clamping various paper core specifications.
[0036] Alternatively, please continue reading Figure 1 and Figure 7 The piston 103 is provided with a cone structure 1031, and the claw disk 102 is provided with a mating inclined surface 1022 on the side facing the piston 103. The cone structure 1031 and the mating inclined surface 1022 are mated, thereby driving the claw disk 102 to expand and move in a direction perpendicular to the moving direction of the piston 103 (arrow Y direction in the figure) (arrow X direction in the figure).
[0037] Optionally, the paper core clamping device also includes a telescopic spring 104. There are multiple telescopic springs 104 and they are respectively connected to the slide rail 101. The telescopic springs 104 are arranged one-to-one with the claw plate 102 and hold the claw plate 102 to drive the claw plate 102 to reset.
[0038] Optionally, see also Figure 8 , Figure 8 yes Figure 1 The embodiment shows a schematic diagram of the cylinder body; the paper core clamping device in this embodiment also includes a clamping connecting plate 105 and a cylinder body 106. The cylinder body 106 has a circular ring structure, with both ends fixedly connected to the clamping connecting plate 105 and the slide rail plate 101 respectively, forming a sealed cavity 1000. The piston 103 is located in the sealed cavity 1000. The clamping connecting plate 105 is fixedly connected to the rewinder frame (not shown in the figure), and an air inlet channel 1051 is provided in the middle. The air inlet channel 1051 is connected to an external air source device. High-pressure gas is introduced into the sealed cavity 1000 through the air inlet channel 1051, thereby driving the piston 103 to move along the sealed cavity 1000 in the Y direction in the figure.
[0039] Optionally, the paper core clamping device in this embodiment further includes a reset spring 107, which is disposed in the sealed cavity 1000. The two ends of the reset spring 107 respectively support the piston 103 and the slide rail 101, and are used to drive the piston 103 to reset.
[0040] The piston 103 is provided with a sliding seal 108 on the outer wall of the cylinder 106 to achieve sliding sealing between the piston 103 and the cylinder 106. The sliding seal 108 can be a rubber ring structure.
[0041] Alternatively, please continue reading Figure 1 The paper core clamping device in this embodiment also includes a guide rod 109. One end of the guide rod 109 is fixedly connected to the piston 103, and the other end is inserted into the guide hole 1013 of the slide rail 101 to guide the movement of the piston 103.
[0042] The paper core clamping device also includes a cylinder sleeve 110 and multiple spring fixing plates 111. The multiple spring fixing plates 111 are arranged one-to-one with the telescopic springs 104 and are fixedly connected to the slide rail 101 respectively. The telescopic springs 104 are fixedly connected to the spring fixing plates 111. The cylinder sleeve 110 is sleeved on the outer periphery of the slide rail 101 and covers the spring fixing plates 111.
[0043] The working process of the paper core clamping device is as follows: After compressed air is introduced into the sealed cavity 1000, the compressed air pushes the piston 103 from the initial position (towards the Y direction in the figure) to the moving position. The return spring is compressed and stores energy. The tapered part at the front of the piston 103 moves forward and pushes the claw plate 102 to expand outward (along the X direction in the figure). The telescopic spring is compressed and stores energy. After the claw plate 102 fixes the paper core, the fixing action of the paper core is completed.
[0044] After the paper roll is rewound, the compressed air source is turned off. The return spring resets and drives the piston to the initial position. The compressed extension spring then resets, and the claw plate also resets from the moving state to the initial position. Subsequently, the paper core is ejected, and the rewinding is completed. The above actions of fixing and releasing the paper core are achieved by the start and stop of the compressed air.
[0045] The paper core clamping device in this embodiment adopts a pneumatic piston and a replaceable claw plate. By simply controlling the start and stop of compressed air, the claw plate can be effectively controlled to fix the paper core. At the same time, the replaceable claw plate size can realize various paper core curling operations according to different paper core specifications. This fundamentally solves the problem of manual installation and replacement of paper core clamps and realizes the problem of automated paper core installation, fixing and disassembly.
[0046] The paper core chuck device in this embodiment fundamentally solves the problems of most paper core chuck devices still relying on manual operation, resulting in long roll changeover times, high labor intensity, decreased equipment utilization, and issues such as loose paper rolls and uneven end faces caused by paper core misalignment or uneven clamping force. Currently, automated chucks can shorten roll changeover time by more than 50%, reduce downtime losses, and improve overall equipment efficiency (OEE) by 10%-15%. Secondly, precise clamping force control and adaptive adjustment can reduce paper core loss rate and reduce paper roll scrap due to improper clamping, saving hundreds of thousands of yuan annually. Simultaneously, it significantly reduces manual labor intensity and has achieved good results in actual production. Furthermore, automation technology reduces reliance on skilled workers, lowering labor costs and safety risks. High-reliability chucks can drive the development of rewinders towards high speed and intelligence, helping companies undertake high-precision paper product orders, enhancing market competitiveness, and providing underlying equipment support for the paper industry to achieve digital factories, demonstrating significant industrial upgrading value.
[0047] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.
Claims
1. A paper core clamping device, characterized in that, The paper core clamping device includes: A slide rail, wherein the slide rail is provided with multiple sliding mating pairs; Multiple claw discs are provided, each corresponding to one of the sliding mating pairs, and can slide along the sliding mating pairs; A piston is positioned at the center of the plurality of claw discs and is used to drive the plurality of claw discs to move in a direction away from each other, thereby causing the plurality of claw discs to expand to clamp the paper core.
2. The paper core clamping device according to claim 1, characterized in that, The slide rail plate has multiple radially arranged slide grooves, and the claw plate has a slide rail. The slide rail and the slide grooves cooperate to form the sliding mating pair.
3. The paper core clamping device according to claim 2, characterized in that, The piston has a conical structure, and the claw disc has a mating inclined surface on the side facing the piston. The conical structure and the mating inclined surface cooperate to drive the claw disc to expand and move in a direction perpendicular to the piston's movement direction.
4. The paper core clamping device according to claim 3, characterized in that, The paper core clamping device also includes multiple telescopic springs, each connected to the slide rail. The telescopic springs are arranged in a one-to-one correspondence with the claw plates and hold the claw plates, thereby driving the claw plates to reset.
5. The paper core clamping device according to claim 4, characterized in that, The paper core clamping device also includes a clamping connecting plate and a cylinder. The cylinder is fixedly connected to the clamping connecting plate and the slide rail plate respectively and surrounds them to form a sealed cavity. The piston is located in the sealed cavity. The clamping connecting plate is provided with an air inlet channel. High-pressure gas is introduced into the sealed cavity through the air inlet channel, thereby driving the piston to move along the sealed cavity.
6. The paper core clamping device according to claim 5, characterized in that, The paper core clamping device also includes a return spring, which is disposed in the sealed cavity. The two ends of the return spring respectively support the piston and the slide rail plate, and are used to drive the piston to return to its original position.
7. The paper core clamping device according to claim 5, characterized in that, The piston has a sliding seal on its outer wall that mates with the cylinder, which is used to achieve a sliding seal between the piston and the cylinder.
8. The paper core clamping device according to claim 5, characterized in that, The paper core clamping device also includes a guide rod, one end of which is fixedly connected to the piston, and the other end is inserted into the guide hole of the slide rail plate to guide the movement of the piston.
9. The paper core clamping device according to claim 4, characterized in that, The paper core clamping device also includes a cylinder sleeve and multiple spring fixing plates. The multiple spring fixing plates are arranged one-to-one with the telescopic springs and are fixedly connected to the slide rail plate respectively. The telescopic springs are fixedly connected to the spring fixing plates. The cylinder sleeve is sleeved on the outer periphery of the slide rail plate and covers the spring fixing plates.
10. A rewinding machine, characterized in that, The rewinder includes the paper core clamping device as described in any one of claims 1-9.