A plastic roll slitting device and method

Abstract

This invention discloses a plastic roll slitting device and method, relating to the field of plastic roll slitting technology. It includes a frame, traction module, tensioning assembly, dual-station rotary frame, cutting mechanism, pressing mechanism, and speed-stabilizing flipping mechanism. Utilizing the mechanical energy storage and fluid damping characteristics of the speed-stabilizing flipping mechanism, smooth, speed-limited rotation is achieved during alternating dual-station operations. By coordinating the dual-station rotary frame with the cutting and pressing mechanisms, this invention allows the continuous winding operation of the equipment to overlap with the manual unloading and bagging operation in parallel time, eliminating equipment downtime. Furthermore, in existing technologies, frequent manual roll changing and pressing are prone to errors due to fatigue; accidental rotation of the winding shaft can trap the operator's hand. This solution requires only one manual loading operation per large roll at the initial winding stage, with subsequent slitting handled by the automatic cutting and pressing mechanisms, significantly reducing high-frequency, dangerous interventions.

Description

Technical Field

[0001] This invention relates to the field of plastic roll slitting technology, and specifically to a plastic roll slitting device and method. Background Technology

[0002] Plastic rolls are typically produced in the form of large-diameter, heavy master rolls during the front-end manufacturing process. In order to meet the processing and use needs of downstream multiple scenarios or the retail needs of the end market, these large master rolls must be rewound and divided into several small rolls that are easy to handle and use, according to the set length or weight standards.

[0003] Currently, conventional plastic roll slitting operations mainly rely on single-station winding equipment in conjunction with manual operation. The typical existing workflow is as follows: the equipment starts running, with the winding shaft at a single station rotating at high speed to wind a fixed length; when the roll reaches the preset conditions (such as a set length), the entire traction and winding equipment must be completely stopped; subsequently, the operator approaches the machine with a knife, manually cuts the taut plastic roll laterally, and unloads the fully loaded finished roll from the winding shaft for subsequent bagging and packaging; then, the operator manually pulls and guides the new end of the cut roll, and re-clamps it onto the empty winding shaft using tape or manual pressing; after confirming that clamping is complete and the operator has retreated to a safe distance, the start button is pressed again, and the equipment restarts for the next round of winding.

[0004] The existing slitting methods and equipment have significant shortcomings: First, during each slitting cycle, the equipment must be completely stopped to allow manual completion of the lengthy serial process of cutting, unloading, bagging, and re-clamping, resulting in long downtime and low overall slitting capacity. Second, operators frequently handle the taut material area with knives, posing a significant risk of cuts. More seriously, since each small roll requires manual feeding and clamping, this highly frequent and tedious repetitive manual operation easily leads to fatigue and distraction. If a misoperation occurs during manual clamping (such as accidentally touching the start switch before the hand is completely removed from the danger zone, or operating before the machine has come to a complete stop), the high-speed rotating take-up shaft can instantly pull the operator's hand and clothing into the machine, causing extremely serious mechanical injury accidents and posing a huge safety hazard. Summary of the Invention

[0005] The purpose of this invention is to provide a plastic roll slitting device and method that eliminates downtime by using dual-station parallel operation, achieves smooth repositioning through damping, avoids safety hazards, and realizes high-efficiency production.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A plastic roll slitting device includes: a frame; a placement rack located at the front of the frame for placing large rolls of plastic; a traction module including multiple drive guide rollers; a tensioning assembly located on the frame and diagonally above the take-up shaft at the take-up station, used to retract the cut end of the roll at the moment the roll is cut and the tension is released, allowing the new end of the roll to fall naturally under gravity; a dual-station rotary frame rotatably connected to the frame, the dual-station rotary frame having two take-up shafts symmetrically arranged around its main rotating shaft, and two take-up motors symmetrically fixedly mounted on the dual-station rotary frame, each take-up motor corresponding to one of the take-up shafts and its output shaft fixedly connected to the central axis of the take-up shaft; and a cutting mechanism located in the middle of the dual-station rotary frame. The device is used to cut the roll material after alternating locking at each station; the pressing mechanism, located next to the cutting mechanism, is used to simultaneously press the new end of the roll material into the empty take-up shaft currently in the take-up station after the roll material is cut; the speed-stabilizing flipping mechanism is driven to the rotating main shaft; the speed-stabilizing flipping mechanism includes a one-way transmission component, an energy storage damping component, and an unlocking and positioning component; when the energy storage damping component is compressed and stores energy, the one-way transmission component rotates in the opposite direction, and the dual-station rotary frame remains stationary and locked; the unlocking and positioning component is used to release the lock on the dual-station rotary frame at the end of the energy storage; when the energy storage damping component releases energy, it drives the dual-station rotary frame to rotate in the forward direction through the one-way transmission component, and uses its own fluid damping characteristics to limit the rotation speed of the dual-station rotary frame until it rotates to the fixed angle and relocks.

[0008] By adopting the above technical solution, and by setting up a dual-station rotary frame in conjunction with the cutting mechanism and the pressing mechanism, the continuous winding operation of the equipment and the manual unloading and bagging operation are carried out in parallel and overlapped in time, eliminating the downtime of the equipment. At the same time, in the existing technology, the high-frequency manual roll changing and pressing are prone to errors due to fatigue. Once the winding shaft rotates accidentally, the operator's hand will be caught. In this solution, each large roll only needs to be manually loaded once at the initial winding. Subsequent winding is completed by the automatic cutting and pressing mechanism, which greatly reduces the high-frequency dangerous intervention actions and avoids the safety hazards of mechanical entanglement from the root.

[0009] A further improvement of the technical solution of the present invention is that: the one-way transmission assembly includes a one-way bearing sleeved on the rotating spindle, and a gear coaxially fixed to the outer ring of the one-way bearing; a transmission box is fixedly connected to the top of the frame, and both the gear and the one-way bearing are located inside the transmission box; an operating lever is slidably connected to the transmission box, one end of the operating lever extends to the outside of the transmission box and is fixedly connected to a handle, and the other end of the operating lever is inside the transmission box and is fixedly connected to a transmission rack, which meshes with the gear; an energy storage damping element is disposed inside the transmission box, and both ends of the energy storage damping element abut against or are fixed between the inner wall of the transmission box and the inner end of the operating lever, respectively, for compressing and storing force when the handle is pressed, and providing a stable rebound force when the handle is released.

[0010] By adopting the above technical solution, and by setting up a one-way bearing, gear and transmission rack, the operator's pressing action is set to a reverse idling and compression storage stage, which physically isolates the direct interference of uneven human thrust on the rotating spindle; and after the handle is released, the stable rebound force of the energy storage damping component combined with the forward locking of the one-way bearing drives the rotation of the slewing frame, which transforms the uncontrollable manual force into a stable mechanical constant force output, and completely solves the problem of uneven force on the coil and breakage caused by manual switching of work positions.

[0011] A further improvement of the technical solution of the present invention is that: the energy storage damping component includes a piston cylinder fixedly connected inside the transmission box, a piston rod slidably connected inside the piston cylinder, an extension rod fixedly connected to one end of the piston rod, and the end of the extension rod away from the piston rod fixedly connected to the transmission rack. A first spring is sleeved on the outside of the piston cylinder, and the two ends of the first spring abut against the transmission rack and the inner wall of the transmission box, respectively. An air inlet pipe and an exhaust pipe are provided on the piston cylinder. A one-way valve is provided inside both the air inlet pipe and the exhaust pipe. A flow regulating valve is provided inside the air inlet pipe, and the air flow rate of the air inlet pipe is less than that of the exhaust pipe.

[0012] By adopting the above technical solution, an asymmetric pneumatic circuit with unidirectional flow restriction is constructed by independently setting an intake pipe and an exhaust pipe on the piston cylinder, and setting the air flow rate of the intake pipe to be less than that of the exhaust pipe. This resolves the mechanical contradiction between the need for stable speed during reset and the effort required for pressing. Specifically, during the manual pressing and power-accumulating phase, positive pressure is formed inside the piston cylinder, and the internal gas is quickly discharged through the high-flow exhaust pipe, completely eliminating the obstruction effect of air pressure on the piston column. This allows the operator to easily and smoothly complete the pressing action by only overcoming the physical elasticity of the first spring, avoiding the effort problem caused by pneumatic resistance.

[0013] A further improvement of the technical solution of the present invention is that: the unlocking and positioning component includes an indexing plate fixedly connected to the outside of the rotating spindle, two locking holes symmetrically opened on the outside of the indexing plate, a first slide rod slidably connected to one side of the transmission box, a pad fixedly connected to one end of the first slide rod, and a limit head fixedly connected to the other end of the first slide rod through the outside of the transmission box, a second spring sleeved on the outside of the first slide rod, the two ends of the second spring respectively abutting against the pad and the transmission box, a locking pin fixedly connected to the end of the pad away from the first slide rod, and a linkage paddle fixedly connected to the transmission rack.

[0014] By adopting the above technical solution, by fixing a linkage paddle on the transmission rack, the unlocking action is integrated and hidden at the end of the horizontal power storage stroke of the transmission rack. The operator does not need to specifically find and operate the unlocking mechanism. He only needs to perform a simple natural action of pressing the operating lever handle. At the moment the power storage is completed, the linkage paddle will automatically push open the lock pin to achieve precise unlocking, which optimizes the operating experience and greatly simplifies the workstation switching process.

[0015] A further improvement of the technical solution of the present invention is that: the pressing mechanism includes a mounting block fixedly connected to the take-up shaft, the mounting block has a cavity inside, and a guide rod is fixedly connected in the cavity. A slider is slidably connected to the outside of the guide rod, and a pressure strip is fixedly connected to one side of the slider. A strip-shaped groove extending axially is opened on the side of the take-up shaft near the pressure strip. A third spring is sleeved on the outside of the guide rod and on the side of the slider away from the take-up shaft. An iron block is fixedly connected to the mounting block, and an electromagnet that cooperates with the iron block is fixedly connected to the side wall of the slider.

[0016] By adopting the above technical solution, by integrating the pressing mechanism on the winding shaft, the sliding of the slider on the guide rod is used to realize the retraction and pressing of the pressing strip. Only conventional and inexpensive conductive slip rings need to be arranged on the rotating main shaft to power the electromagnet, which completely avoids the sealing and leakage problems caused by introducing complex air circuits on the high-speed rotating shaft, and greatly reduces the manufacturing cost and maintenance difficulty of the equipment.

[0017] A further improvement of the technical solution of the present invention is that: the cutting mechanism includes a gantry frame fixedly connected to the top of the machine frame and a fixed platform fixedly connected to the top of the machine frame; a cylinder is fixedly connected to the top of the gantry frame, and a pressure seat is fixedly connected to the piston rod of the cylinder, and a slot is opened in the middle of the pressure seat and the fixed platform; a linear module is fixedly installed at the bottom of the fixed platform, and a cutting blade is fixedly connected to the movable part of the linear module, and the cutting blade passes through the slot in the middle of the fixed platform.

[0018] Using the above technical solution, after the dual-station rotary frame completes the station alternation and relocks, the control system triggers the cutting command. At this time, the cylinder fixed on the gantry at the top of the machine frame acts first, its piston rod extends downward, driving the pressure seat to press against the fixed platform at the top of the lower machine frame. Before the cutting action occurs, the pressure seat and the fixed platform cooperate to pre-clamp the taut plastic roll material. This timing control of clamping before cutting ensures that the roll material is subjected to uniform rigid pressure across the entire cutting width, effectively avoiding slippage, wrinkling, or slanted cutting caused by uneven force or changes in front-end tension at the moment of cutting, and ensuring the flatness of the slit.

[0019] A further improvement of the technical solution of the present invention is that: the tensioning assembly includes symmetrically opened slide grooves on the gantry, a second slide rod is fixedly connected inside the slide groove, a tensioning block is slidably connected outside the second slide rod, a fourth spring is sleeved outside the second slide rod and below the tensioning block, and a tensioning roller is rotatably connected between the two tensioning blocks on their adjacent sides.

[0020] Using the above technical solution, during normal continuous winding operations, the plastic roll conveyed by the traction module passes over the tension roller between the two tension blocks. Because the roll is taut under the pull of the high-speed winding shaft, the downward tension forces the tension roller, along with the tension blocks at both ends, to overcome the bottom support force and move downwards along the second slide bar within the gantry's groove. Simultaneously, it compresses the fourth spring sleeved below the tension blocks, causing it to undergo elastic deformation and accumulate elastic potential energy. During this dynamic winding process, the upward thrust of the fourth spring and the downward tension of the roll form a dynamic mechanical balance. The tension roller plays an excellent role in flexible buffering, adaptively absorbing the sudden tension changes caused by minor fluctuations in rotational speed between the traction module and the winding shaft, maintaining a constant tension in the roll, and effectively preventing the roll from loosening, wrinkling, or breaking due to instantaneous tension.

[0021] A further improvement of the technical solution of the present invention is that: the opening of the lock hole is provided with a guide rounded corner on one side along the positive rotation direction of the indexing plate, and the side of the lock hole opening opposite to the positive rotation direction is a vertical stop surface; the end of the locking pin near the lock hole is provided with a pointed tip to facilitate sliding into the guide rounded corner.

[0022] By adopting the above technical solution, this phenomenon is resolved by designing the keyhole opening on the indexing plate as an asymmetrical structure. When the indexing plate rotates in the forward direction and approaches the positioning point, the second spring releases its elastic force to push the first slide rod inward, so that the tip of the locking pin contacts the keyhole first and slides into the keyhole smoothly and with low resistance along the guide rounded corner on one side. The gentle slope effect of the guide rounded corner greatly reduces the rigid impact force and guides the locking pin to complete the initial insertion smoothly and quickly.

[0023] A further improvement of the technical solution of the present invention is that: the two sides of the groove opening on the take-up shaft are both rounded; the surface of the pressure strip near the groove is covered with a flexible damping material layer.

[0024] By employing the above technical solution, smooth rounded corners are created on both sides of the groove opening of the take-up shaft, completely eliminating the risk of sharp metal edges cutting the coil material. This allows the new end of the hanging coil material to smoothly transition and bend along the arc surface when pressed into the groove, avoiding stress concentration. At the same time, when the electromagnet is de-energized and the third spring pushes the slider and pressure bar inward, the flexible damping material layer wrapped on the surface of the pressure bar first comes into contact with the coil material. Under the continuous thrust of the third spring, the flexible damping material layer undergoes slight elastic deformation, transforming rigid impact into flexible clamping and protecting the coil material from mechanical damage.

[0025] This invention also discloses a method for slitting plastic rolls, comprising: sequentially drawing a large roll of plastic roll through multiple guide rollers and then sending it to a winding position for fixed-length slitting; cutting and unwinding the rolls after slitting; and adopting a dual-station alternating winding mode, specifically including the following steps:

[0026] S1: The plastic roll is pulled to the take-up shaft currently in the take-up station for take-up operation. The station is locked during the take-up operation.

[0027] S2: When the winding shaft reaches the set condition, the station lock is released, and the station switching is smoothly driven in one direction by a combination of mechanical energy release and damping speed limiting until the alternation between the winding station and the unloading station is completed and the lock is re-locked.

[0028] S3: After the workstation is locked, the cutting mechanism cuts the plastic roll and simultaneously clamps the new end of the cut roll onto the winding shaft currently in the winding station. The winding shaft in the winding station then begins winding.

[0029] S4: During the synchronous time window when the winding shaft at the winding station is continuously winding, the operator manually bags and unloads the full roll of material on the winding shaft at the unloading station, and waits for the next station changeover.

[0030] In step S1, the large plastic roll is guided by the guide roller of the traction module, and the end is fixed on the winding shaft of the winding station. When the motor drives the winding shaft to rotate at high speed, the dual-station rotary frame is rigidly locked by the unlocking positioning component. The plastic roll will generate huge unidirectional drag tension when it is wound at high speed. The locked state is an extremely necessary anti-tension benchmark, which ensures that the rotary frame is absolutely stationary during the winding cycle of up to tens of minutes, avoiding station deviation and roll deviation caused by tension, and ensuring the basic quality of fixed-length winding.

[0031] In step S2, the set condition refers to the number of meters or the diameter of the roll reaching the system preset value;

[0032] The combination of mechanical energy storage and release with damping speed limiting is as follows: before or at the moment of release, the operator manually applies a unidirectional external force to convert kinetic energy into elastic potential energy for storage; after unlocking, this elastic potential energy serves as the sole power source to drive the dual-station rotary frame to rotate 180°, while fluid damping is connected in parallel along the release path to physically reduce the instantaneous burst force of potential energy release and limit the speed.

[0033] By adopting the above technical solution, the technical effects achieved by this invention compared to the prior art are as follows:

[0034] 1. This invention, by setting up a dual-station rotary frame in conjunction with a cutting mechanism and a pressing mechanism, allows the continuous winding operation of the equipment and the manual unloading and bagging operation to be carried out in parallel and overlapped in time, eliminating the downtime of the equipment. At the same time, in the prior art, the high-frequency manual roll changing and pressing is prone to misoperation due to fatigue. Once the winding shaft rotates accidentally, it will cause the operator's hand to be caught. In this solution, each large roll only needs to be manually loaded once at the initial winding. Subsequent roll splitting is completed by the automatic cutting and pressing mechanism, which greatly reduces the high-frequency dangerous intervention actions and avoids the safety hazards of mechanical entanglement from the root.

[0035] 2. This invention introduces a switching drive structure that couples mechanical energy storage with fluid damping, enabling the dual-station rotary frame to achieve a smooth and uniform attitude transition when switching the take-up shaft. Meanwhile, in existing technologies, rigid drives or pneumatic direct drives often generate instantaneous mechanical impacts, causing extremely thin plastic rolls to break or develop severe wrinkles during switching. This solution utilizes the speed-limiting characteristics of fluid damping to effectively absorb the kinetic energy of the switching impact, ensuring the absolute stability of the roll tension during high-speed slitting and improving the end-face quality and yield of the slitting finished product.

[0036] 3. This invention, by employing a combination of gear and rack transmission components and one-way bearings, forcibly restricts the dual-station rotary frame to only perform step-by-step rotary positioning in a single safe direction. Simultaneously, in existing technologies, the rotary mechanism is prone to reverse displacement or slight rebound when the cutter is pressed down or under uneven force, leading to material deviation or loosening during winding. This solution, through the physical locking characteristic of the one-way transmission component, eliminates the risk of reverse retraction of the rotary frame from the mechanical level, ensuring the station accuracy and high reliability of continuous slitting operations.

[0037] 4. This invention uses an asymmetric locking pin structure to physically limit the working positions of the dual-station rotary frame, achieving instantaneous and precise self-locking of the rotary frame when it reaches the designated winding or unloading position. Meanwhile, conventional symmetrical pins in existing technologies are prone to developing clearances under long-term high-frequency cutting impacts, leading to slight wobbling at the working positions. The asymmetric design of this solution not only enables automatic wedging compensation after wear but also significantly shortens the response and release time of the locking pin, ensuring the service life of the equipment.

[0038] 5. This invention establishes a time window synchronization mechanism for automatic cutting and pressing and manual unloading and bagging in the control method, perfectly integrating the two originally sequential processes in terms of physical time. At the same time, in the prior art, operators often have to frantically complete unloading and rewinding after the machine stops, which is extremely labor-intensive and prone to errors. This solution utilizes the logical timing difference of the semi-automatic dual-station to give operators ample and leisurely unloading and packaging time. Attached Figure Description

[0039] The invention will now be further described with reference to the accompanying drawings.

[0040] Figure 1 This is a three-dimensional structural diagram of the entire invention from a first-view perspective;

[0041] Figure 2 This is a three-dimensional structural diagram of the entire invention from a second perspective;

[0042] Figure 3 This is a schematic diagram of the cutting mechanism of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of the dual-station rotary frame of the present invention;

[0044] Figure 5 This is one of the structural schematic diagrams of the pressing mechanism of the present invention;

[0045] Figure 6 This is a second schematic diagram of the pressing mechanism of the present invention;

[0046] Figure 7 This is a schematic diagram of the structure of the speed-stabilizing flipping mechanism of the present invention;

[0047] Figure 8 This is a schematic diagram of the disassembled structure of the energy storage damping component of the present invention;

[0048] Figure 9 This is a schematic diagram of the mounting structure of the gear and indexing plate of the present invention;

[0049] Figure 10 This is a partial structural diagram of the unlocking and positioning component of the present invention.

[0050] In the diagram: 1. Frame; 2. Placement frame; 3. Traction module; 4. Tensioning assembly; 401. Slide rail; 402. Second slide bar; 403. Fourth spring; 404. Tensioning block; 405. Tensioning roller; 5. Dual-station rotary frame; 501. Rotary spindle; 502. Rewinding shaft; 503. Rewinding motor; 6. Cutting mechanism; 601. Gantry frame; 602. Cylinder; 603. Pressure seat; 604. Fixed platform; 605. Linear module; 606. Cutting blade; 607. Slit; 7. Pressing mechanism; 701. Mounting block; 702. Cavity; 703. Guide rod; 704. Slider; 705. Third spring 706. Spring; 707. Pressure bar; 708. Strip groove; 709. Iron block; 7000. Electromagnet; 8. Speed-stabilizing flipping mechanism; 801. Operating lever; 802. One-way bearing; 803. Transmission rack; 804. Gear; 805. Handle; 811. Piston cylinder; 812. Extending rod; 813. First spring; 814. Exhaust pipe; 815. Intake pipe; 816. Piston column; 821. Indexing plate; 822. Lock hole; 823. Guide fillet; 824. First slide rod; 825. Limit head; 826. Pad; 827. Second spring; 828. Locking pin; 829. Linkage lever; 9. Transmission box. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the embodiments.

[0052] Example 1

[0053] like Figures 1-10As shown, this invention provides a plastic roll slitting device, comprising: a frame 1; a placement rack 2, disposed at the front of the frame 1, for placing large rolls of plastic; a traction module 3, including multiple guide rollers for driving force; a tensioning assembly 4, disposed on the frame 1 and located obliquely above the take-up shaft 502 at the take-up station, for driving the new end of the cut roll to retract at the moment the roll is cut and the tension is released, so that the new end of the roll falls naturally under gravity; a dual-station rotary frame 5, rotatably connected to the frame 1, the dual-station rotary frame 5 having two take-up shafts 502 symmetrically arranged with its main rotating shaft 501 as the central axis, and two take-up motors 503 symmetrically fixedly installed on the dual-station rotary frame 5, the take-up motors 503 corresponding one-to-one with the take-up shafts 502 and the output shafts fixedly connected to the central axis of the take-up shafts 502; and a cutting mechanism 6. A material cutting mechanism 7, located in the middle of the dual-station rotary frame 5, is used to cut the roll material after the stations are alternately locked. A pressing mechanism 7, located next to the cutting mechanism 6, is used to simultaneously press the new end of the roll material into the currently unloaded take-up shaft 502 at the take-up station after the roll material is cut. A speed-stabilizing flipping mechanism 8 is connected to the rotating main shaft 501. This speed-stabilizing flipping mechanism 8 includes a one-way transmission component, an energy storage damping component, and an unlocking and positioning component. When the energy storage damping component is compressed and stores energy, the one-way transmission component rotates in the opposite direction, and the dual-station rotary frame 5 remains stationary and locked. The unlocking and positioning component is used to release the lock on the dual-station rotary frame 5 at the end of the energy storage. When the energy storage damping component releases its energy, it drives the dual-station rotary frame 5 to rotate in the forward direction through the one-way transmission component, and uses its own fluid damping characteristics to limit the rotation speed of the dual-station rotary frame 5 until it reaches its fixed angle and is relocked.

[0054] In the traditional plastic roll slitting process, single-station equipment must be completely stopped after the roll is full. Operators must manually cut, unload, bag, and re-clamp the roll. This not only results in long machine downtime and low overall productivity, but also poses safety hazards such as manually holding the cutter close to the taut roll and reaching into the winding danger zone to press the roll, as well as mechanical entanglement. In particular, since pressing is required after each slitting, the high-frequency operation itself carries significant risks, and the long-term repetitive operation can easily lead to misoperation, such as accidentally starting the winding process during clamping and pressing, which could result in a safety accident.

[0055] In this embodiment, by setting up a dual-station rotary frame 5 in conjunction with the cutting mechanism 6 and the pressing mechanism 7, the continuous winding operation of the equipment and the manual unloading and bagging operation are carried out in parallel and overlapped in time, eliminating the downtime of the equipment. At the same time, in the prior art, the high-frequency manual roll changing and pressing is prone to misoperation due to fatigue. Once the winding shaft 502 rotates accidentally, it will cause the operator's hand to be caught. In this solution, each large roll only needs to be manually loaded once at the initial winding. Subsequent roll splitting is completed by the automatic cutting and pressing mechanism 7, which greatly reduces the high-frequency dangerous intervention actions and avoids the safety hazards of mechanical entanglement from the root.

[0056] Furthermore, by setting a tensioning component 4 diagonally above the winding station, when the cutting mechanism 6 cuts the roll and the front tension disappears instantly, the tensioning component 4 uses elastic return to drive the new end of the roll to retreat diagonally upward, so that the new end of the roll loses traction and falls naturally downward by its own weight, accurately falling into the pressing area of ​​the unloaded winding shaft 502, thus realizing physical guidance of material receiving without human intervention.

[0057] Furthermore, by configuring a speed-stabilizing flipping mechanism 8, the disordered operating force applied manually in one direction is converted into the potential energy of the energy storage damping component. After unlocking, the fluid damping characteristics are used to limit the speed of the potential energy release process, forcing the dual-station rotary frame 5 to alternate stations at a stable and safe speed, thus avoiding sudden changes in rotation speed and the risk of the coil breaking caused by direct manual pushing and pulling.

[0058] During work:

[0059] Place the large roll of plastic on the placement rack 2 at the front of the frame 1, control the rotation of the guide roller on the traction module 3, and pull the plastic roll through the guide roller and tensioning component 4 in sequence, and reach the winding shaft 502 currently in the winding station for continuous winding. At this time, the unlocking and positioning component in the speed-stabilizing and flipping mechanism 8 keeps the dual-station rotary frame 5 stationary and locked.

[0060] When the winding reaches the set requirements, the operator applies a unidirectional force to the speed-stabilizing and flipping mechanism 8, forcing the energy storage damping component to be compressed and store energy. At this time, the unidirectional transmission component rotates in reverse, and the position of the dual-station rotary frame 5 remains stationary. As the energy storage action reaches the end, the unlocking and positioning component is triggered and releases the mechanical lock on the dual-station rotary frame 5. The operator stops applying the force, and the energy storage damping component releases the stored energy, driving the dual-station rotary frame 5 to rotate around the rotating main shaft 501 as the central axis through the unidirectional transmission component. At the same time, the fluid damping characteristics of the energy storage damping component generate a reverse resistance force to limit the rotational angular velocity of the dual-station rotary frame 5 until the dual-station alternating fixed angle rotation is in place and is relocked by the unlocking and positioning component.

[0061] After the alternating locking of the workstations is completed, the cutting mechanism 6 cuts the roll of material. The cutting of the roll of material causes the tension at the front end to be released instantly. The tensioning component 4 located at the upper angle retracts and pulls back the new end of the roll of material. The new end of the roll of material falls naturally to the surface of the empty take-up shaft 502 that has been transferred to the take-up station due to gravity. The pressing mechanism 7 then presses the falling new end of the roll of material into the empty take-up shaft 502 and fixes it. The empty take-up shaft 502 begins a new round of continuous take-up operation. During this synchronous time window, the operator manually bags and unloads the full roll of material at the unloading station, completing the semi-automatic rewinding cycle.

[0062] like Figure 7 and Figure 9 As shown, in this embodiment, preferably, the one-way transmission assembly includes a one-way bearing 802 sleeved on the rotating spindle 501, and a gear 804 coaxially fixed to the outer ring of the one-way bearing 802; a transmission box 9 is fixedly connected to the top of the frame 1, and the gear 804 and the one-way bearing 802 are both located inside the transmission box 9; an operating lever 801 is slidably connected to the transmission box 9, one end of the operating lever 801 extends to the outside of the transmission box 9 and is fixedly connected to a handle 805, and the other end of the operating lever 801 is inside the transmission box 9 and is fixedly connected to a transmission rack 803, which meshes with the gear 804; an energy storage damping element is disposed inside the transmission box 9, and both ends of the energy storage damping element abut or are fixed between the inner wall of the transmission box 9 and the inner end of the operating lever 801, respectively, for compressing and storing force when the handle 805 is pressed, and providing a stable rebound force when the handle 805 is released.

[0063] To improve efficiency, this solution introduces a dual-station switching design. If an automated (e.g., motor-driven) switching method is used, the sudden automatic rotation can easily cause serious mechanical impact and entanglement injuries to personnel when the operator has not yet withdrawn from the unloading area or when a misoperation occurs. Therefore, this solution must use a manual triggering method to control the station switching to ensure the absolute safety of personnel.

[0064] However, relying entirely on manual operation to push the rotary frame for manual switching makes it extremely difficult to maintain uniform force, which can cause the rotary frame to experience sudden and violent changes in angular acceleration when starting and stopping. This unstable rotation speed can easily stretch and deform the taut plastic roll, or even tear it, making it impossible to guarantee the quality of the roll splitting.

[0065] In this embodiment, by setting the cooperation of one-way bearing 802, gear 804 and transmission rack 803, the operator's pressing action is set to the reverse idling and compression storage stage, which physically isolates the direct interference of uneven human thrust on the rotating spindle 501; and after releasing the handle 805, the stable rebound force of the energy storage damping component combined with the forward locking of the one-way bearing 802 is used to drive the rotating frame to rotate, which transforms the uncontrollable manual force into a stable mechanical constant force output, and completely solves the problem of uneven force on the coil and breakage caused by manual switching of work positions.

[0066] During work:

[0067] The operator presses the handle 805 horizontally outside the transmission box 9. The operating lever 801, under force, drives the transmission rack 803 inside the transmission box 9 to slide in a straight line in the horizontal direction. During the horizontal inward movement of the transmission rack 803, it actuates the gear 804 meshing with it to rotate in the opposite direction. During this reverse rotation, due to the disengagement of the one-way bearing 802 inside the gear 804, the one-way bearing 802 is in a reverse free-sliding state outside the rotating spindle 501. At this time, the rotating spindle 501 and the double-position rotary frame 5 do not rotate and remain stationary. At the same time, the operating lever 801 slides inward to continuously and horizontally compress the energy storage damping component, so that the energy storage damping component is compressed inside the transmission box 9 and accumulates elastic potential energy.

[0068] When the pressing stroke ends and the operator releases the handle 805, the energy storage damping component releases its stored elastic potential energy, providing a stable horizontal rebound thrust to drive the operating lever 801 and the transmission rack 803 to slide outward in the horizontal direction; the transmission rack 803 moves outward horizontally, causing the gear 804 to rotate in the forward direction; at this time, the one-way bearing 802 is in the locked state, and the forward rotation power of the gear 804 is transmitted to the rotating spindle 501 without side slip through the one-way bearing 802, thereby driving the dual-station rotary frame 5 to complete the smooth roll changing rotation operation with a stable mechanical driving force.

[0069] Example 2

[0070] like Figure 7 and Figure 8As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the energy storage damping component includes a piston cylinder 811 fixedly connected inside the transmission box 9. A piston column 816 is slidably connected inside the piston cylinder 811. An extension rod 812 is fixedly connected to one end of the piston column 816. The end of the extension rod 812 away from the piston column 816 is fixedly connected to the transmission rack 803. A first spring 813 is sleeved on the outside of the piston cylinder 811. The two ends of the first spring 813 abut against the transmission rack 803 and the inner wall of the transmission box 9, respectively. An air inlet pipe 815 and an exhaust pipe 814 are provided on the piston cylinder 811. A one-way valve is provided inside both the air inlet pipe 815 and the exhaust pipe 814. A flow regulating valve is provided inside the air inlet pipe 815. The air flow rate of the air inlet pipe 815 is less than that of the exhaust pipe 814.

[0071] In the scheme of using a damping structure to achieve stable speed rotation of the slewing frame, if a conventional bidirectional damper is used, while providing reset speed limit, the internal fluid resistance will also generate huge reverse resistance when the operator manually presses to store force. This means that when the operator presses down the operating lever 801, he / she not only needs to overcome the physical elasticity of the spring itself, but also has to fight against the damping resistance. This will make the manual pressing operation extremely strenuous and difficult, which will not only consume a lot of the operator's physical strength and reduce the comfort of semi-automatic operation, but may even cause the operator to not press in place due to physical exhaustion, resulting in failure to store force or failure of the unlocking positioning component to be triggered normally.

[0072] In this embodiment, by independently setting an intake pipe 815 and an exhaust pipe 814 on the piston cylinder 811, and setting the air flow rate of the intake pipe 815 to be less than that of the exhaust pipe 814, a one-way flow-limited asymmetric pneumatic circuit is constructed, which resolves the mechanical contradiction between the need for stable speed during reset and the effort required during pressing. Specifically, during the manual pressing and power-accumulating stage, a positive pressure is formed in the piston cylinder 811, and the internal gas is quickly discharged through the high-flow exhaust pipe 814, completely eliminating the obstruction effect of air pressure on the piston column 816. This allows the operator to easily and smoothly complete the pressing action by only overcoming the physical elasticity of the first spring 813, avoiding the problem of effort caused by pneumatic resistance.

[0073] When the operator presses the operating lever 801 horizontally inward, the transmission rack 803 moves horizontally inward and simultaneously compresses the first spring 813 sleeved on the outside of the piston cylinder 811, causing the first spring 813 to undergo elastic deformation and accumulate elastic potential energy. At the same time, the transmission rack 803 drives the extension rod 812 to push the piston column 816 to slide inward inside the piston cylinder 811, causing the internal volume of the piston cylinder 811 to shrink rapidly and generate positive pressure. At this time, the one-way valve inside the intake pipe 815 is closed under pressure, and the one-way valve inside the exhaust pipe 814 is opened under pressure, and the pressurized gas in the cylinder is quickly discharged outward through the exhaust pipe 814. Since the exhaust pipe 814 is unrestricted and has a large exhaust volume, the exhaust process is smooth and unaffected, and no air pressure resistance accumulates in the piston cylinder 811, allowing the operator to press the transmission rack 803 to the end of the energy storage stroke with less effort.

[0074] When the operator releases handle 805, the first spring 813 releases its stored elastic potential energy, pushing the transmission rack 803 and the extension rod 812 to slide outward in the horizontal direction; the piston rod 816 is simultaneously pulled outward inside the piston cylinder 811, causing the internal volume of the piston cylinder 811 to expand and generate a negative pressure suction effect; at this time, the one-way valve in the exhaust pipe 814 closes under atmospheric pressure, and external air can only enter the piston cylinder 811 through the one-way valve in the intake pipe 815; since the intake pipe 815 is equipped with a flow regulating valve, and its set intake flow rate is strictly less than the exhaust flow rate of the exhaust pipe 814, external air cannot instantly fill the piston cylinder 811, thus continuously forming an inward negative pressure resistance inside the piston cylinder 811; this negative pressure resistance counteracts the outward thrust of the first spring 813, forcibly limiting the outward sliding speed of the transmission rack 803, and then driving the double-station rotary frame 5 to perform a smooth fixed-angle rotation through the one-way transmission assembly.

[0075] Example 3

[0076] like Figure 7 , Figure 9 and Figure 10 As shown, based on Embodiment 2, the present invention provides a technical solution: Preferably, the unlocking and positioning assembly includes an indexing plate 821 fixedly connected to the outside of the rotating spindle 501. Two locking holes 822 are symmetrically opened on the outside of the indexing plate 821. A first slide rod 824 is slidably connected to one side of the transmission box 9. A pad 826 is fixedly connected to one end of the first slide rod 824, and the other end extends through to the outside of the transmission box 9 and is fixedly connected to a limit head 825. A second spring 827 is sleeved on the outside of the first slide rod 824. The two ends of the second spring 827 abut against the pad 826 and the transmission box 9 respectively. A locking pin 828 is fixedly connected to the end of the pad 826 away from the first slide rod 824. A linkage paddle 829 is fixedly connected to the transmission rack 803.

[0077] In existing semi-automatic dual-station roll changing equipment, the locking / unlocking mechanism of the rotary frame and the flipping drive mechanism are usually physically separated (e.g., using independent manual insertion pins or buckles). This means that when switching stations, operators must first perform the unlocking action and then operate the drive mechanism to flip the frame. Moreover, after the rotary frame is flipped into place, operators often need to manually insert the locking pin 828 back into the hole to fix the station. This separate, multi-step operation process is cumbersome and rigid, resulting in a very poor overall operating experience. It not only increases the operator's workload but also reduces production efficiency and work smoothness in high-frequency continuous roll changing operations.

[0078] In this embodiment, by fixing the linkage paddle 829 on the transmission rack 803, the unlocking action is integrated and hidden at the end of the horizontal power storage stroke of the transmission rack 803. The operator does not need to specifically find and operate the unlocking mechanism. He only needs to perform a simple natural action of pressing the handle 805 of the operating lever 801. At the moment the power storage is completed, the linkage paddle 829 will automatically push open the locking pin 828 to achieve precise unlocking, which optimizes the operating experience and greatly simplifies the workstation switching process.

[0079] Furthermore, by fixing the indexing plate 821 to the rotating spindle 501 and combining the first slide bar 824, the locking pin 828 and the second spring 827 to form an elastic self-resetting locking structure, the dual-station rotary frame 5 automatically springs into lock after rotating 180° to the position. The entire process does not require manual searching of the hole position and manual insertion of the pin, completely eliminating the traditional manual alignment and locking steps, and realizing a seamless closed loop of station alternation.

[0080] Under normal winding operation conditions, the second spring 827 is in a naturally extended or slightly compressed state. Its elastic force pushes the pad 826 and the first slide rod 824 to slide towards the inside of the transmission box 9, so that the locking pin 828 fixed on the pad 826 is tightly inserted into the corresponding locking hole 822 on the outside of the indexing plate 821. Since the indexing plate 821 is coaxially fixed with the rotating spindle 501, the insertion of the locking pin 828 prevents the indexing plate 821 from rotating, thereby stably locking the rotating spindle 501 and the dual-station rotary frame 5 at the current station.

[0081] When a roll change is required, the operator only needs to press the operating lever 801 horizontally inward. The transmission rack 803 slides horizontally inward and compresses the energy storage damping component to store energy. When the transmission rack 803 slides inward to the end of the energy storage stroke, the linkage paddle 829 fixed on the transmission rack 803 moves and contacts the pad 826. As the transmission rack 803 continues to move inward to its limit position, the side of the linkage paddle 829 squeezes and pushes the pad 826, forcing the pad 826 and the first slide rod 824 to overcome the elastic force of the second spring 827 and slide outward. The outward sliding of the pad 826 simultaneously drives the locking pin 828 to pull outward until the locking pin 828 is completely disengaged from the locking hole 822 of the indexing plate 821. At this time, the mechanical lock of the indexing plate 821 is automatically released.

[0082] When the operator releases handle 805, the transmission rack 803 slides outward horizontally to reset and drives gear 804 to rotate in the forward direction. At this time, the linkage paddle 829 moves outward and separates from the pad 826. After the pad 826 loses the lateral pressing force, it resets inward under the rebound force of the second spring 827, so that the end of the locking pin 828 slides against the outer circumference of the rotating indexing plate 821. When the dual-station rotary frame 5 rotates precisely 180° to the position, another symmetrical locking hole 822 on the indexing plate 821 rotates to the position aligned with the locking pin 828. Under the instantaneous thrust of the second spring 827, the locking pin 828 automatically springs into the locking hole 822, and locks the rotating spindle 501 securely again, completing the one-click flipping and positioning.

[0083] like Figure 4 , Figure 5 and Figure 6 As shown, preferably, the pressing mechanism 7 includes a mounting block 701 fixedly connected to the take-up shaft 502. The mounting block 701 has a cavity 702 inside, and a guide rod 703 is fixedly connected in the cavity 702. A slider 704 is slidably connected to the outside of the guide rod 703. A pressure strip 706 is fixedly connected to one side of the slider 704. A strip groove 707 extending axially is opened on the side of the take-up shaft 502 near the pressure strip 706. A third spring 705 is sleeved on the outside of the guide rod 703 and on the side of the slider 704 away from the take-up shaft 502. An iron block 708 is fixedly connected to the mounting block 701, and an electromagnet 709 that cooperates with the iron block 708 is fixedly connected to the side wall of the slider 704.

[0084] In the traditional roll-up stage, operators usually need to manually insert the new end of the roll into the slot of the take-up shaft 502, which is not only time-consuming and laborious, but also poses a great risk of entanglement when operating between roll changes.

[0085] In this embodiment, by integrating the pressing mechanism 7 on the take-up shaft 502, the sliding of the slider 704 on the guide rod 703 is used to realize the retraction and pressing of the pressing strip 706. Only conventional and inexpensive conductive slip rings need to be arranged on the rotating main shaft 501 to supply power to the electromagnet 709, which completely avoids the sealing and leakage problems caused by introducing complex air circuits on the high-speed rotating shaft, and greatly reduces the manufacturing cost and maintenance difficulty of the equipment.

[0086] When the unloaded take-up shaft 502 rotates to the take-up station with the dual-station rotary frame 5 and waits to receive material, the control system controls the electromagnet 709 on the side wall of the slider 704 to be energized; the energized electromagnet 709 generates magnetic force and attracts the iron block 708 fixed on the mounting block 701. This magnetic attraction overcomes the pushing force of the third spring 705 and pulls the slider 704 to slide away from the take-up shaft 502 along the guide rod 703; the pressure bar 706 fixed on one side of the slider 704 moves outward synchronously and completely exits the strip groove 707 on the side of the take-up shaft 502. At this time, the strip groove 707 is in a fully open receiving and avoiding state.

[0087] When the cutting mechanism 6 cuts the roll of material, the new end of the roll is pulled back under the action of the tensioning component 4 and falls naturally under gravity, covering the open strip groove 707. At the same time, the control system cuts off the power supply to the electromagnet 709. The electromagnet 709 loses its magnetic force and releases the iron block 708. The third spring 705 instantly releases its accumulated elastic potential energy, pushing the slider 704 to slide quickly along the guide rod 703 towards the take-up shaft 502. The movement of the slider 704 causes the pressure bar 706 to quickly extend inward, pressing the falling end of the plastic roll directly into the strip groove 707 of the take-up shaft 502. Then, the unloaded take-up shaft 502 begins to rotate and start winding by the motor. The pressure bar 706 relies on the continuous mechanical thrust of the third spring 705 to press the roll into the strip groove 707 and generate sufficient initial winding friction. After the roll rotates with the shaft and wraps around itself once, the tension generated by the roll itself achieves winding self-locking, and the equipment enters the winding state.

[0088] like Figure 1 , Figure 2 and Figure 3 As shown, preferably, the cutting mechanism 6 includes a gantry frame 601 fixedly connected to the top of the frame 1 and a fixed platform 604 fixedly connected to the top of the frame 1; a cylinder 602 is fixedly connected to the top of the gantry frame 601, and a pressure seat 603 is fixedly connected to the piston rod of the cylinder 602; a slot 607 is provided in the middle of both the pressure seat 603 and the fixed platform 604; a straight module 605 is fixedly installed at the bottom of the fixed platform 604, and a cutting blade 606 is fixedly connected to the movable part of the straight module 605; the blade of the cutting blade 606 passes through the slot 607 in the middle of the fixed platform 604.

[0089] In this embodiment, after the dual-station rotary frame 5 completes the station alternation and relocks, the control system triggers the cutting command. At this time, the cylinder 602 fixed on the gantry 601 at the top of the frame 1 is activated first, and its piston rod extends downward to drive the pressure seat 603 to press against the fixed platform 604 at the top of the lower frame 1. Before the cutting action occurs, the pressure seat 603 and the fixed platform 604 cooperate to pre-clamp the taut plastic roll material. This timing control of clamping before cutting ensures that the roll material is subjected to uniform rigid pressure across the entire cutting width, effectively avoiding slippage, wrinkling, or slanted cutting caused by uneven force or changes in front-end tension at the moment of cutting, and ensuring the flatness of the slit.

[0090] While the pressure seat 603 clamps the roll material, the linear module 605 at the bottom of the fixed platform 604 is activated, driving the cutting blade 606 to move quickly along a horizontal linear trajectory. Since the pressure seat 603 and the fixed platform 604 both have corresponding vertical slots 607 in the middle, the cutting blade 606 passes directly through the slot 607 in the middle of the fixed platform 604 during the movement and moves within the slot 607 of the pressure seat 603, thereby cutting the clamped plastic roll material laterally.

[0091] like Figure 2 and Figure 3 As shown, preferably, the tensioning assembly 4 includes symmetrically opened grooves 401 on the gantry frame 601. A second slide rod 402 is fixedly connected inside the groove 401. A tensioning block 404 is slidably connected outside the second slide rod 402. A fourth spring 403 is sleeved outside the second slide rod 402 and below the tensioning block 404. A tensioning roller 405 is rotatably connected between the two tensioning blocks 404 on their adjacent sides.

[0092] In this embodiment, during normal continuous winding operations, the plastic roll conveyed by the traction module 3 passes over the tension roller 405 between the two tension blocks 404. Because the roll is taut under the tension of the high-speed winding shaft 502, the downward running tension forces the tension roller 405, along with the tension blocks 404 at both ends, to overcome the bottom support force and move downwards along the second slide bar 402 within the groove 401 of the gantry 601. Simultaneously, it compresses the fourth spring 403, which is sleeved below the tension blocks 404, causing it to undergo elastic deformation and accumulate elastic potential energy. During this dynamic winding process, the upward thrust of the fourth spring 403 and the downward tension of the roll form a dynamic mechanical balance. The tension roller 405 provides excellent flexible buffering, adaptively absorbing the sudden tension changes caused by minor fluctuations in rotational speed between the traction module 3 and the winding shaft 502, maintaining a constant tension in the roll and effectively preventing the roll from loosening, wrinkling, or breaking due to instantaneous tension.

[0093] When the cutting mechanism 6 cuts the plastic roll laterally, the control pressure seat 603 resets to release the plastic roll. At this time, the compressed fourth spring 403 loses its downward resistance, thereby releasing its accumulated elastic potential energy, bouncing upward and pushing the tension block 404 and tension roller 405 to slide upward and reset along the second slide bar 402. This upward lifting action of the tension roller 405 forcibly pulls the new end of the cut roll to a physical retraction displacement diagonally upward. This retraction displacement not only quickly pulls the new end of the roll away from the sharp cutting area to avoid secondary interference, but more importantly, it allows the new end of the roll to be precisely guided by gravity at the highest point and naturally fall to the surface of the empty take-up shaft 502 located diagonally below it.

[0094] like Figure 9 As shown, preferably, the opening of the lock hole 822 is provided with a guide rounded corner 823 on one side along the positive rotation direction of the indexing plate 821, and the side of the opening of the lock hole 822 away from the positive rotation direction is a vertical stop surface; the end of the locking pin 828 near the lock hole 822 is provided with a pointed tip to facilitate sliding into the guide rounded corner 823.

[0095] In the semi-automatic flipping mechanism, due to the large overall rotational inertia of the dual-station rotary frame 5 and the fully loaded coil, when the indexing plate 821 rotates rapidly with the rotating spindle 501 to the 180° positioning point, the conventional flat-head locking pin 828 and the straight cylinder locking hole 822 are very likely to collide violently and bounce off (i.e., the "flying pin" phenomenon commonly seen in the machinery industry), resulting in inaccurate locking or severe wear on the edge of the locking hole 822.

[0096] In this embodiment, this phenomenon is resolved by designing the opening of the lock hole 822 on the indexing plate 821 as an asymmetrical structure. When the indexing plate 821 rotates in the forward direction and approaches the positioning point, the second spring 827 releases its elastic force to push the first slide rod 824 inward, so that the tip of the locking pin 828 contacts the lock hole 822 first, and slides into the lock hole 822 very smoothly and with low resistance along the guide rounded corner 823 on one side. The gentle slope effect of the guide rounded corner 823 greatly weakens the rigid impact force, guiding the locking pin 828 to complete the initial insertion smoothly and quickly.

[0097] Once the locking pin 828 is fully inserted into the lock hole 822, its side will immediately abut against the vertical stop surface opposite to the positive rotation direction. This vertical stop surface is perpendicular to the direction of force on the rotation tangent, completely blocking the tendency of the indexing plate 821 to continue to slip forward due to the huge rotational inertia. At this time, the huge inertial shear force on the locking pin 828 is directly borne by the solid stop surface, which eliminates the possibility of the locking pin 828 being squeezed out again along the arc surface from a physical and geometric point of view.

[0098] like Figure 6As shown, preferably, the two sides of the groove 707 on the take-up shaft 502 have smooth rounded corners; the surface of the pressure strip 706 near the groove 707 is covered with a flexible damping material layer.

[0099] In this embodiment, by creating smooth rounded corners on both sides of the groove opening of the strip groove 707 on the take-up shaft 502, the potential for sharp metal edges to cut the coil material is completely eliminated. This allows the new end of the hanging coil material to smoothly transition and bend along the arc surface when it is pressed into the strip groove 707, avoiding stress concentration. At the same time, when the electromagnet 709 is de-energized and the third spring 705 pushes the slider 704 and the pressure bar 706 to move inward, the flexible damping material layer wrapped on the surface of the pressure bar 706 comes into contact with the coil material first.

[0100] This invention also provides a method for slitting plastic rolls, comprising: sequentially drawing a large roll of plastic roll through multiple guide rollers and then sending it to a winding position for fixed-length slitting; cutting and unwinding the rolls after slitting; and employing a dual-station alternating winding mode, specifically including the following steps:

[0101] S1: The plastic roll is pulled onto the take-up shaft 502, which is currently in the take-up station, for take-up operation. The station is locked during the take-up operation.

[0102] S2: When the take-up shaft 502 is wound to the set condition, the station lock state is released, and the station switching is smoothly driven in one direction by a combination of mechanical energy release and damping speed limit until the alternation between the take-up station and the unloading station is completed and the lock is re-locked.

[0103] S3: After the workstation is locked, the cutting mechanism 6 cuts the plastic roll and simultaneously clamps the new end of the cut roll onto the take-up shaft 502, which is currently in the take-up station. The take-up shaft 502 in the take-up station then begins the take-up operation.

[0104] S4: During the synchronous time window when the take-up shaft 502 at the take-up station is continuously taking up material, the operator manually bags and unloads the full roll of material on the take-up shaft 502 at the unloading station, and waits for the next station changeover.

[0105] In step S1, the large plastic roll is guided by the guide roller of the traction module 3, and the end is fixed on the winding shaft 502 of the winding station. When the motor drives the winding shaft 502 to rotate at high speed, the dual-station rotary frame 5 is rigidly locked by the unlocking positioning component. The plastic roll will generate huge unidirectional drag tension when it is wound at high speed. The locked state is an extremely necessary anti-tension benchmark, which ensures that the rotary frame is absolutely stationary during the winding cycle of tens of minutes, avoids station deviation and roll deviation caused by tension, and ensures the basic quality of fixed-length winding.

[0106] In step S2, the set condition refers to the number of meters or the diameter of the roll reaching the system preset value;

[0107] The combination of mechanical energy storage and release with damping speed limiting is as follows: before or at the moment of release, the operator manually applies a unidirectional external force to convert kinetic energy into elastic potential energy for storage; after unlocking, this elastic potential energy serves as the sole power source to drive the dual-station rotary frame 5 to rotate 180°, while fluid damping is connected in parallel along the release path to physically reduce the instantaneous burst force of potential energy release and limit the speed.

[0108] At the moment of relocking in step S2, the control command triggers the cutting blade 606 to cut the roll laterally. At the moment of cutting, due to the sudden disappearance of the front-end traction tension, the new end of the cut roll naturally falls to the surface of the unloaded take-up shaft 502 under the guidance of gravity or tensioning component 4. At this time, the pressing mechanism 7 operates synchronously, using flexible friction to press the new end of the roll into the strip groove 707 of the unloaded take-up shaft 502, and uses the friction of the roll winding itself to complete the winding.

[0109] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A device for dividing a plastic roll, comprising a frame (1); characterized in that: Also includes: A placement rack (2) is set at the front of the frame (1) for placing large rolls of plastic. The traction module (3) includes multiple guide rollers that drive the traction. The tensioning component (4) is set on the frame (1) and located diagonally above the winding shaft (502) at the winding station. It is used to drive the new end of the cut-off roll back at the moment the roll is cut and the tension is released, so that the new end of the roll falls naturally under gravity. A dual-station rotary frame (5) is rotatably connected to the frame (1). The dual-station rotary frame (5) has two take-up shafts (502) symmetrically arranged with its main rotating shaft (501) as the central axis. Two take-up motors (503) are also symmetrically fixedly installed on the dual-station rotary frame (5). The take-up motors (503) correspond one-to-one with the take-up shafts (502) and their output shafts are fixedly connected to the central axis of the take-up shafts (502). The cutting mechanism (6) is located in the middle of the double-station rotary frame (5) and is used to cut the roll material after the station is locked alternately; The pressing mechanism (7) is located next to the cutting mechanism (6) and is used to press the new end of the roll into the empty take-up shaft (502) that is currently in the take-up station after the roll is cut. A speed-stabilizing flipping mechanism (8) is connected to the rotating main shaft (501). The speed-stabilizing flipping mechanism (8) includes a one-way transmission component, an energy storage damping component, and an unlocking and positioning component. When the energy storage damping component is compressed and stores energy, the one-way transmission component rotates in the opposite direction, and the dual-station rotary frame (5) remains stationary and locked. The unlocking and positioning component is used to release the lock on the dual-station rotary frame (5) at the end of the energy storage. When the energy storage damping component releases energy, it drives the dual-station rotary frame (5) to rotate in the forward direction through the one-way transmission component, and uses its own fluid damping characteristics to limit the rotation speed of the dual-station rotary frame (5) until it rotates to the fixed angle and is relocked. The one-way transmission assembly includes a one-way bearing (802) sleeved on the rotating spindle (501) and a gear (804) coaxially fixed to the outer ring of the one-way bearing (802); a transmission box (9) is fixedly connected to the top of the frame (1), and the gear (804) and the one-way bearing (802) are both located inside the transmission box (9); an operating lever (801) is slidably connected to the transmission box (9), one end of the operating lever (801) extends to the outside of the transmission box (9) and is fixedly connected to a handle ( 805), the other end of the operating lever (801) is inside the transmission box (9) and fixedly connected to the transmission rack (803), the transmission rack (803) meshes with the gear (804); the energy storage damping element is disposed inside the transmission box (9), and the two ends of the energy storage damping element respectively abut against or are fixed between the inner wall of the transmission box (9) and the inner end of the operating lever (801), for being compressed and stored when the handle (805) is pressed, and providing a stable rebound force when the handle (805) is released; The energy storage damping component includes a piston cylinder (811) fixedly connected inside the transmission box (9). A piston column (816) is slidably connected inside the piston cylinder (811). An extension rod (812) is fixedly connected to one end of the piston column (816). The end of the extension rod (812) away from the piston column (816) is fixedly connected to the transmission rack (803). A first spring (813) is sleeved on the outside of the piston cylinder (811). The two ends of the first spring (813) abut against the transmission rack (803) and the inner wall of the transmission box (9), respectively. An air inlet pipe (815) and an exhaust pipe (814) are provided on the piston cylinder (811). A one-way valve is provided inside the air inlet pipe (815) and the exhaust pipe (814). A flow regulating valve is provided inside the air inlet pipe (815). The air flow rate of the air inlet pipe (815) is less than that of the exhaust pipe (814). The unlocking and positioning assembly includes an indexing plate (821) fixedly connected to the outside of the rotating spindle (501). Two locking holes (822) are symmetrically opened on the outside of the indexing plate (821). A first slide rod (824) is slidably connected to one side of the transmission box (9). A pad (826) is fixedly connected to one end of the first slide rod (824), and the other end extends through to the outside of the transmission box (9) and is fixedly connected to a limit head (825). A second spring (827) is sleeved on the outside of the first slide rod (824). The two ends of the second spring (827) abut against the pad (826) and the transmission box (9) respectively. A locking pin (828) is fixedly connected to the end of the pad (826) away from the first slide rod (824). A linkage paddle (829) is fixedly connected to the transmission rack (803).

2. The plastic roll slitting device according to claim 1, characterized in that: The pressing mechanism (7) includes a mounting block (701) fixedly connected to the take-up shaft (502). The mounting block (701) has a cavity (702) inside, and a guide rod (703) is fixedly connected in the cavity (702). A slider (704) is slidably connected to the outside of the guide rod (703). A pressure strip (706) is fixedly connected to one side of the slider (704). A strip groove (707) extending axially is opened on the side of the take-up shaft (502) near the pressure strip (706). A third spring (705) is sleeved on the outside of the guide rod (703) and on the side of the slider (704) away from the take-up shaft (502). An iron block (708) is fixedly connected to the mounting block (701), and an electromagnet (709) that cooperates with the iron block (708) is fixedly connected to the side wall of the slider (704).

3. A plastic web dividing apparatus according to claim 2, wherein: The cutting mechanism (6) includes a gantry frame (601) fixedly connected to the top of the frame (1) and a fixed platform (604) fixedly connected to the top of the frame (1); a cylinder (602) is fixedly connected to the top of the gantry frame (601), and a pressure seat (603) is fixedly connected to the piston rod of the cylinder (602). A slot (607) is opened in the middle of both the pressure seat (603) and the fixed platform (604); a straight module (605) is fixedly installed at the bottom of the fixed platform (604), and a cutting blade (606) is fixedly connected to the movable part of the straight module (605). The blade of the cutting blade (606) passes through the slot (607) in the middle of the fixed platform (604).

4. A plastic web dividing apparatus according to claim 3, wherein: The tensioning assembly (4) includes a slide groove (401) symmetrically opened on the gantry frame (601). A second slide rod (402) is fixedly connected inside the slide groove (401). A tensioning block (404) is slidably connected outside the second slide rod (402). A fourth spring (403) is sleeved outside the second slide rod (402) and below the tensioning block (404). A tensioning roller (405) is rotatably connected between the two tensioning blocks (404) on their adjacent sides.

5. A plastic web dividing apparatus according to claim 4, wherein: The opening of the lock hole (822) is provided with a guide rounded corner (823) on one side of the indexing plate (821) in the positive rotation direction, and the side of the opening of the lock hole (822) opposite to the positive rotation direction is a vertical stop surface; the end of the locking pin (828) near the lock hole (822) is provided with a pointed tip to facilitate sliding into the guide rounded corner (823).

6. The plastic web dividing apparatus of claim 2 wherein: The groove (707) on the take-up shaft (502) has smooth rounded corners on both sides of the groove opening; the surface of the pressure strip (706) near the groove (707) is covered with a flexible damping material layer.

7. A method of dispensing a plastic web, comprising: The plastic roll slitting device according to any one of claims 1 to 6 includes: sequentially drawing a large roll of plastic material through multiple guide rollers and then sending it to a winding position for fixed-length slitting; cutting and unloading the roll after slitting; and adopting a dual-station alternating winding mode, specifically including the following steps: S1: The plastic roll is pulled to the winding shaft (502) currently in the winding station for winding operation. The station is locked during the winding operation. S2: When the winding shaft (502) is wound to the set condition, the station lock state is released, and the station switching is smoothly driven in one direction by a combination of mechanical energy release and damping speed limit until the alternation between the winding station and the unloading station is completed and the station is locked again. S3: After the workstation is locked, the cutting mechanism (6) cuts the plastic roll and simultaneously clamps the new end of the cut roll onto the take-up shaft (502) which is currently in the take-up station. The take-up shaft (502) in the take-up station starts the take-up operation. S4: During the synchronous time window when the take-up shaft (502) at the take-up station is continuously taking up the material, the operator manually puts bags on the full roll of material on the take-up shaft (502) at the unloading station and pulls it out, and waits for the next station change.

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