An aluminum plastic machine non-stop roll changing device

Abstract

The embodiment of the application provides a non-stop roll changing device of an aluminum-plastic machine, which comprises: a buffer device and an electric control system installed on a main frame; the buffer device comprises a U-shaped buffer bin, a motor pressure roller assembly, a baffle limiting assembly, an outlet material blocking assembly and a shaft roller assembly; the buffer bin has an inlet and an outlet; the motor pressure roller assembly is arranged at the inlet of the buffer bin; the baffle limiting assembly is arranged at the outlet of the buffer bin and comprises a pair of stainless steel baffles with adjustable width; the outlet material blocking assembly is arranged at the external outlet of the buffer bin and comprises a pair of stainless steel material blocking bodies with adjustable width; a plurality of shaft rollers of the shaft roller assembly are arranged inside and outside the buffer bin to form a winding material conveying path from the inlet to the outlet; and the electric control system is signal connected with the motor pressure roller assembly. The technical scheme provided by the application can achieve the core effects that the aluminum-plastic machine does not need to stop during the replacement of PVC / PVDC coiled materials, the operation is safe and simple, the space utilization rate is high, and the operation is stable and reliable.

Description

Technical Field

[0001] This invention belongs to the field of pharmaceutical equipment technology, and in particular relates to a non-stop roll changing device for an aluminum-plastic composite machine. Background Technology

[0002] With the rapid development of the pharmaceutical industry, pharmaceutical manufacturers are paying more and more attention to the lean production indicators of pharmaceutical equipment, and people are also demanding higher and higher levels of intelligent use of equipment.

[0003] Currently, when changing PVC / PVDC rolls, aluminum-plastic composite (APC) machines on the market generally require stopping the main APC machine and subsequent packaging equipment before changing and splicing the PVC / PVDC packaging material. Changing rolls multiple times a day reduces production efficiency. This operation will lower the OEE (Output Effectiveness) of pharmaceutical manufacturers and fail to meet the requirements of lean production.

[0004] Existing technologies employ "film storage boxes" with horizontal conveyor belts to buffer PVC. These structures occupy a large horizontal space and have limited buffer capacity. Their drive control relies on simple motors and clutches for starting and stopping, resulting in low control precision and insufficient synchronization and stability in material transport. Other technologies can achieve automatic roll material handling and depletion warnings, but they do not address the continuous material supply buffering function during splicing, essentially still requiring a shutdown for splicing operations.

[0005] In summary, existing technologies suffer from drawbacks such as low space utilization efficiency, rough control, and poor reliability, and fail to truly solve the problem of continuous supply during splicing. Summary of the Invention

[0006] The embodiment of this application provides a non-stop roll changing device for an aluminum-plastic composite machine, which can achieve the core effects of changing PVC / PVDC rolls without stopping the machine, safe and simple operation, high space utilization, and stable and reliable operation.

[0007] In a first aspect, embodiments of this application provide a non-stop roll changing device for an aluminum-plastic composite machine, comprising:

[0008] Main frame, buffer unit, and electronic control system;

[0009] The buffer unit and electronic control system are mounted on the main frame;

[0010] The buffer device includes a U-shaped buffer chamber, a motor pressure roller assembly, a baffle limiting assembly, an outlet blocking assembly, and a shaft roller assembly;

[0011] The buffer bin has an inlet and an outlet; a motor-driven pressure roller assembly is located at the inlet of the buffer bin and includes a drive roller and a rotating roller that can move relative to each other to press or separate; a baffle limiting assembly is located at the outlet of the buffer bin and includes a pair of adjustable-width stainless steel baffles; an outlet retaining assembly is located at the outlet of the buffer bin and includes a pair of adjustable-width stainless steel retaining bodies; multiple rollers of the roller assembly are arranged inside and outside the buffer bin to form a packaging material conveying path that meanders from the inlet to the outlet;

[0012] The electrical control system is connected to the motor and roller assembly via signal transmission.

[0013] In one alternative embodiment, the electronic control system includes an operation box assembly; the operation box assembly is provided with control buttons configured to send control signals to the motor roller assembly in response to user operation.

[0014] In one alternative implementation, the electronic control system further includes a material shortage sensor; the material shortage sensor is located on the packaging material conveying path downstream of the buffer bin and is electrically connected to the electronic control system.

[0015] In one alternative implementation, the electronic control system further includes a limit sensor; the limit sensor is fixed to one side of the buffer compartment via a sensor mounting bracket, and a reflector paired with the limit sensor is fixed to the other side of the buffer compartment via a reflector mounting plate.

[0016] In one optional embodiment, the motor pressure roller assembly further includes a servo motor and a cylinder; the servo motor is connected to the drive roller; the drive roller is rotatably mounted on a movable support plate; the rotating roller is fixedly mounted on a fixed support plate; the telescopic rod of the cylinder is connected to the movable support plate to drive the movable support plate and the drive roller to swing, thereby causing the drive roller to press against or away from the rotating roller.

[0017] In one alternative implementation, the servo motor is connected to the drive roller via a reducer, pulleys, and a belt to form a belt drive.

[0018] In one optional embodiment, the outlet baffle assembly further includes a support plate, a connecting square tube, a baffle body, a pressure roller, a connecting block, a connecting plate, a rotating shaft, and an adjusting handle;

[0019] A pair of stainless steel baffles are threadedly connected to a connecting square tube; the connecting square tube is threadedly connected to a support plate; the outlet baffle assembly is fixed to the buffer device via the support plate; the adjusting handle can drive the stainless steel baffles to move along the width of the packaging material.

[0020] In one alternative embodiment, the baffle limiting assembly further includes a lead screw and a handwheel; a pair of stainless steel baffles are threadedly connected to the lead screw; the handwheel is connected to one end of the lead screw; rotating the handwheel can drive the stainless steel baffles to move along the width direction of the packaging material.

[0021] In one alternative embodiment, the baffle limiting assembly further includes a digital position display; the digital position display is used to show the position of the stainless steel baffle.

[0022] In one alternative embodiment, the roller assembly includes an in-bucket roller disposed inside the buffer bin and a fifth-position roller disposed at the outlet of the buffer bin.

[0023] In one alternative embodiment, the roller assembly further includes a sensor-position roller one and a sensor-position roller two; the sensor-position roller one and the sensor-position roller two are arranged opposite to each other to form a channel through which the packaging material passes, and the detection area of ​​the material shortage sensor corresponds to the channel.

[0024] In one alternative implementation, the main frame is provided with an openable protective door; the buffer device also includes a removable door detachably mounted on the front of the buffer compartment.

[0025] The technical solution provided in this application embodiment uses a U-shaped vertically designed buffer bin combined with a specific multi-axis roller assembly to form a meandering path. Utilizing the natural downward folding of the material due to gravity, it achieves large-capacity buffering of packaging materials within a limited vertical space. This structure does not occupy additional horizontal space and provides ample buffer time for roll changing and splicing. The motor-driven roller assembly employs a servo motor and cylinder in synergy, achieving high-precision closed-loop control of the drive roller's speed and downward pressure. This ensures that the material conveying speed is strictly synchronized with the main unit during buffer collection and release, preventing material stretching, accumulation, or sudden tension changes, thus guaranteeing operational stability. The adjustable-width baffle limiting assembly, through a screw drive principle, can quickly and accurately adapt to different packaging material widths, effectively preventing material deviation during buffering and conveying. The integrated electronic control system, combined with a material shortage sensor located at a critical path node, enables intelligent monitoring of material status and one-button operation, significantly improving the automation level and response speed of the roll changing process. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an aluminum-plastic machine non-stop roll changing device provided in an embodiment of this application;

[0027] Figure 2 This is an isometric view of the main frame of a non-stop roll changing device for an aluminum-plastic composite machine provided in an embodiment of this application;

[0028] Figure 3 This is an isometric view of a buffer device in a non-stop roll changing device for an aluminum-plastic machine, as provided in an embodiment of this application.

[0029] Figure 4 This is a plan view of a buffer device for a non-stop roll changing device for an aluminum-plastic composite machine, provided in an embodiment of this application.

[0030] Figure 5 This is a top view of the motor pressure roller assembly of a non-stop roll changing device for an aluminum-plastic machine provided in an embodiment of this application;

[0031] Figure 6 This is a front view of the motor pressure roller assembly of a non-stop roll changing device for an aluminum-plastic machine provided in an embodiment of this application;

[0032] Figure 7 This is a top view of a baffle limiting assembly of a non-stop roll changing device for an aluminum-plastic machine provided in an embodiment of this application;

[0033] Figure 8 This is an isometric view of a baffle limiting assembly of a non-stop roll changing device for an aluminum-plastic machine provided in an embodiment of this application;

[0034] Figure 9 This is an isometric view of the outlet baffle assembly of a non-stop roll changing device for an aluminum-plastic composite machine provided in an embodiment of this application;

[0035] Figure 10 This is a diagram showing the buffer state PVC / PVDC flow of an aluminum-plastic machine roll changing device without stopping, provided in an embodiment of this application.

[0036] Figure 11 This is a diagram of a material shortage sensor detection device for a non-stop roll changing device for an aluminum-plastic machine, provided in an embodiment of this application.

[0037] In the picture:

[0038] 1. Main frame; 11. Protective glass door; 12. Stainless steel hinged door; 2. Buffer device; 21. Buffer compartment; 22. Main back plate; 23. Motor pressure roller assembly; 231. Servo motor; 232. Reducer; 233. Mounting plate; 234. Movable support plate; 235. Fixed support plate; 236. Rotating roller; 237. Drive roller; 238. Cylinder; 239. Pulley; 2310. Belt; 2311. Cylinder support; 2312. Connecting clamp; 2313. Rotating shaft; 24. Bottom support; 25. Removable door; 251. Top protrusion; 252. Side protrusion; 26. Baffle limiting assembly; 261. Stainless steel baffle; 262. Left lead screw shaft; 263. Right lead screw shaft; 264. Middle base; 265. Self-lubricating bushing; 266. Retaining ring; 267. Digital position display; 268. Clamping plate; 269. Left handwheel; 2610. Inner support base; 2611. Guide shaft; 2612. Sliding copper sleeve; 2613. Right handwheel; 2614. Outer support base; 271. No. 1 position shaft Rollers; 272, No. 2 shaft roller; 273, No. 3 shaft roller; 274, No. 4 shaft roller; 275, No. 5 shaft roller; 276, No. 6 shaft roller; 277, No. 7 shaft roller; 278, No. 8 shaft roller; 279, In-bin shaft roller; 2710, Sensor position shaft roller one; 2711, Sensor position shaft roller two; 28, Outlet baffle assembly; 281, Support plate; 282, Connecting square tube; 283, Baffle body; 284, Pressure roller; 285, Connecting block; 286, First connecting plate; 287, Rotating shaft; 2 88. Adjustment handle; 29. ​​Support beam; 210. Limit sensor; 2101. Sensor mounting bracket; 2102. Reflector; 2103. Reflector mounting bracket; 3. Electrical control system; 31. Electrical control cabinet assembly; 32. Operation box assembly; 33. Fault indicator light; 4. Aluminum-plastic machine main unit; 41. Splicing platform; 42. PVC / PVDC packaging material slot one; 43. PVC / PVDC packaging material slot two; 44. Material shortage sensor sensing position; 45. Material shortage sensor detection area; 46. Second connecting plate. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Figure 1 This is a schematic diagram of a non-stop roll changing device for an aluminum-plastic composite machine provided in an embodiment of this application. The blue part shows the direction of PVC / PVDC during operation. Figures 1-11As shown, the core components of the non-stop roll changing device for the aluminum-plastic composite machine include three main parts: the main frame 1, the buffer device 2, and the electrical control system 3. The main frame 1 serves as the support and installation foundation for the entire device and is typically welded from robust and durable materials such as stainless steel square tubing. The buffer device 2 and the electrical control system 3 are both integrated and installed on the main frame 1. This modular layout makes the device compact and easy to install and integrate alongside existing aluminum-plastic composite machine production lines without requiring large-scale modifications to the main unit.

[0041] In some embodiments, the main frame 1 is provided with an openable protective door. In this embodiment, the main frame 1 is typically provided with two types of protective doors: a transparent protective glass door 11 and a stainless steel hinged door 12. Both the protective glass door 11 and the stainless steel hinged door 12 are equipped with door opening protection devices. When the door is opened, a safety switch is triggered, and the switch signal is immediately transmitted to the electronic control system 3. The system determines that the operating environment is unsafe, thereby prohibiting dangerous actions or triggering an alarm to achieve intrinsic safety. The protective glass door 11 and the stainless steel hinged door 12 constitute the complete shell of the main frame 1, and their main functions are physical isolation and safety protection. The transparency of the protective glass door 11 allows operators to visually observe the folding and conveying status of the internal packaging materials of the buffer device 2 and the working status of key components without opening the door, facilitating status monitoring and preliminary fault diagnosis; the stainless steel hinged door 12 provides more robust protection.

[0042] The buffer device 2 is the core mechanical module that enables the non-stop operation function. It mainly includes a buffer bin 21, a main back plate 22, a motor pressure roller assembly 23, a bottom support 24, a detachable door 25, a baffle limit assembly 26, a shaft roller assembly, an outlet baffle assembly 28, a support beam 29, and a limit sensor 210, etc.

[0043] The buffer compartment 21 is the main body of the buffer device 2. Its structure is specially designed in a U-shape, consisting of five stainless steel panels. An opening is located on the front, which is sealed by a removable door 25. The buffer compartment 21 is fixed to the main back plate 22 with screws. Two support beams 29 are installed on both sides of the buffer compartment 21 and the main back plate 22. The buffer device 2 is fixed to the main frame 1 via these two support beams. The buffer compartment 21 defines the space for temporary storage of packaging materials, with clearly defined entrances and exits.

[0044] To enable intelligent monitoring of the stacking position of packaging materials within the buffer compartment 21, a limit sensor 210 is also installed inside the buffer compartment 21. This sensor typically employs a through-beam or reflective photoelectric switch. A sensor mounting bracket 2101 secures the transmitting and receiving units of the limit sensor 210 to one side wall inside the buffer compartment 21. On the other side wall, opposite the sensor, a reflector 2102 is fixed via a reflector mounting bracket 2103.

[0045] The entire system works as follows: The limit sensor 210 continuously emits infrared light, which is reflected back to the sensor after hitting the reflector 2102. When the light path is unobstructed, the sensor outputs a "pass" signal, indicating that the package material has not reached the detection point. When the package material in the buffer bin 21 is accumulating or being consumed, and its edge rises or falls into the detection area and blocks the light path, the reflected light is cut off, and the sensor immediately outputs a "trigger" signal.

[0046] Limit sensor 210 is a key component in maintaining the packaging material in an ideal "V"-shaped pre-stored state within the buffer compartment. For example... Figure 1 As shown, in this state, one end of the "V" shape is consumed by the main body 4 of the aluminum-plastic machine at a constant speed, while the other end is fed by the servo motor 231 in the motor roller assembly 23 according to control commands. The control logic of the entire system is as follows: the limit sensor 210 detects the position of the bottom point of the "V" shape (i.e., the material level) in real time. When the main body consumes material and the material level rises and moves out of the sensor detection area, the sensor signal changes, and the electrical control system 3 (PLC) immediately commands the servo motor 231 to start or accelerate, replenishing the packaging material in the bin and causing the material level to drop. When the replenished packaging material reaches the detection position again and blocks the sensor, the signal changes again, and the electrical control system 3 commands the servo motor 231 to stop or decelerate.

[0047] Through this dynamic closed-loop control, the system can automatically maintain a stable "V"-shaped buffer state. This design has two core advantages: first, it avoids the packaging material being continuously stretched, thus preventing width narrowing and reduced forming accuracy due to its elasticity; second, it provides a stable and sufficient buffer for roll changing operations, ensuring an uninterrupted material supply to the main unit during roll changing and splicing. The signal from the limit sensor 210 is not only used to maintain dynamic balance, but can also be set as a "full material" safety upper limit or an "empty material" warning lower limit. Ultimately, the electronic control system 3 automatically controls the precise movement of the motor pressure roller assembly 23, or issues a warning to the operator through the fault indicator light 33, greatly improving the automation level, control accuracy, and operational reliability of the device.

[0048] The motor-driven pressure roller assembly 23 mainly includes a servo motor 231, a reducer 232, an adjusting mounting plate 233, a movable support plate 234, a fixed support plate 235, a rotating roller 236, a drive roller 237, a cylinder 238, a pulley 239, a belt 2310, a cylinder support 2311, a connecting clamping plate 2312, and a rotating shaft 2313. The motor-driven pressure roller assembly 23 is fixed to the upper left side of the main back plate 22, i.e., at the entrance of the buffer compartment 21. This assembly serves as both the "gate" and the "power source" for controlling the entry of packaging materials into the buffer compartment 21. The servo motor 231 is connected to the reducer 232 and fixed to the adjusting mounting plate 233, which is fixed to the movable support plate 234. The drive roller 237 is fixed to the movable support plate 234 via bearings. The rotating roller 236 is fixed to the fixed support plate 235 via bearings. The rotating roller 236 can rotate within the fixed support plate 235, which is fixed to the main back plate 22 of the buffer compartment 21. The cylinder 238 is fixed to the fixed support plate 235 via cylinder support 2311. The rotating shaft 2313 is fixed to the fixed support plate 235 via bearings. One end of the rotating shaft 2313 is connected to the movable support plate 234, and the other end is connected to the connecting clamping plate 2312. The telescopic rod of the cylinder 238 is fixed together with the connecting clamping plate 2312. The servo motor 231, as a power source, can control the rotation and stop of the drive roller 237 via belt drive, providing precise, adjustable, and stable rotational motion. The telescopic movement of the cylinder 238 can control the movable support plate 234 to rotate at a certain angle, thereby driving the drive roller 237 to press down or lift up.

[0049] Furthermore, the servo motor 231 is connected to the drive roller 237 via a reducer 232, pulley 239, and belt 2310, forming a belt drive connection. In this specific configuration, the output shaft of the servo motor 231 is first connected to the input end of the reducer 232. The reducer 232 is an independent transmission component whose core function is to reduce the high speed output of the servo motor 231 while increasing the output torque by a fixed ratio to meet the relatively low speed but high torque requirements of the drive roller 237 when pulling packaging materials. The power after speed adjustment and torque amplification by the reducer 232 is transmitted from its output shaft to a drive pulley 239. Correspondingly, a driven pulley is installed on the shaft of the drive roller 237. A closed annular belt 2310 is tightly fitted into the grooves of the two pulleys 239, thereby establishing a flexible mechanical connection between them. The design concept of adopting this specific transmission form is based on a comprehensive consideration of the device's operational stability, reliability, and ease of maintenance. Belt drives are non-rigid transmissions. Their inherent elasticity and damping characteristics naturally absorb and buffer the minor impacts and vibrations generated when the servo motor 231 starts, stops, and adjusts its speed, preventing these vibrations from being directly transmitted to the drive roller 237. This avoids the instantaneous shaking or slippage of the packaging material conveying that may occur due to excessive transmission rigidity. The frictional transmission between the belt 2310 and the pulley 239 also provides a certain degree of overload protection; when the driving resistance increases abnormally, the belt may slip, thus protecting precision components such as the servo motor 231 and the reducer 232 from damage.

[0050] To ensure the material smoothly enters the buffer chamber 21 during buffering and seamlessly synchronizes with the main machine speed after roll changing and splicing, the drive unit needs two key capabilities: precise and continuous adjustment of rotational speed and controllable clamping pressure on the packaging material. The servo motor 231 addresses the first requirement. It receives commands from the electronic control system 3 and outputs precise rotational speed and torque, ensuring that the linear speed of the drive roller 237 always matches the material pulling speed of the aluminum-plastic machine main machine 4, thus preventing material accumulation or overstretching during the buffering and collection stage. The cylinder 238 addresses the second requirement. Its linear thrust is converted into a downward or upward oscillating motion of the drive roller 237 via the movable support plate 234. When the telescopic rod of the cylinder 238 extends, it pushes the movable support plate 234 to rotate around its fulcrum (usually via a rotating shaft 2313), causing the drive roller 237 to press against the stationary rotating roller 236. The pressure between the two is determined by the air pressure of the cylinder and can be adjusted according to the different materials and thicknesses of the packaging material, ensuring sufficient clamping force without damaging the material. When the telescopic rod of cylinder 238 retracts, the drive roller 237 is lifted and separated from the rotating roller 236, allowing the packaging material to pass freely or stop conveying. The motor-driven pressure roller assembly 23 is installed at the PVC / PVDC inlet of the buffer bin 2 and is primarily used to control the unwinding action of the PVC / PVDC. The drive roller 237 and the rotating roller 236 can be controlled to generate relative motion, achieving pressing contact or separation. When they press together, they can clamp and pull the packaging material; when they separate, they release the packaging material.

[0051] The servo motor 231 replaces the simple start-stop motor or clutch structure of traditional technology, providing a smooth speed curve and fast dynamic response, fundamentally avoiding material jitter or tension abrupt changes caused by speed step changes. The pressure control provided by the cylinder 238 allows the clamping force to be flexibly adjusted according to process requirements, protecting brittle packaging materials and ensuring no slippage during the drive process. This significantly improves the stability and reliability of the buffering and roll changing processes.

[0052] The baffle limiting assembly 26 mainly includes two stainless steel baffles 261 (left and right), a left lead screw shaft 262, a right lead screw shaft 263, an intermediate base 264, a self-lubricating bushing 265, a retaining ring 266, a digital position display 267, a clamping plate 268, a left handwheel 269, an inner support base 2610, a guide shaft 2611, a sliding copper sleeve 2612, a right handwheel 2613, and an outer support base 2614. The left lead screw shaft 262 and the right lead screw shaft 263 form a "well"-shaped connection with the two intermediate bases 264. Retaining rings 266 are provided on both sides of the intermediate base 264 to axially limit the left lead screw shaft 262 and the right lead screw shaft 263, allowing the left lead screw shaft 262 and the right lead screw shaft 263 to rotate relative to each other within the through holes of the intermediate base 264. Self-lubricating bushings 265 are provided inside the intermediate base 264 to facilitate rotation. One end of the left lead screw shaft 262 is threaded to the inner support base 2610, and the other end is connected to the left handwheel 269. The right lead screw shaft 263 is threaded to the outer support base 2614, and on the same side, it is connected to the right handwheel 2613. Two guide shafts 2611 are fixed to the middle base 264, allowing the inner support base 2610 and outer support base 2614 to move linearly along the guide shafts 2611. Sliding copper sleeves 2612 are inlaid in both the inner and outer support bases 2610 and 2614, respectively. Two stainless steel baffles 261 are fixed to the inner and outer support bases 2610 and 2614, respectively. The stainless steel baffles 261 have angled ends, forming a variable-width channel to facilitate the passage of PVC / PVDC. Digital position displays 267 are located at the front ends of the two handwheels, and are fixed to the guide shafts 2611 by clamps 268. The baffle limiting component 26 is fixed inside the buffer chamber 21 at the PVC / PVDC outlet position to limit the PVC / PVDC in the buffer chamber 21 and prevent it from shifting laterally.

[0053] Specifically, during operation, when adapting to PVC or PVDC packaging materials of different widths, operators do not need to use any tools; they simply rotate the left handwheel 269 on the left or the right handwheel 2613 on the right. For example, rotating the right handwheel 2613 clockwise drives the right lead screw 263 to rotate, causing the outer support base 2614 and the connected right stainless steel baffle 261 to move to the left along the guide shaft 2611, thereby reducing the channel width between the two baffles; rotating counterclockwise increases the width. The adjustment principle on the left side is the same. By observing the real-time values ​​displayed on the digital position display 267 installed at the front of the handwheel, operators can accurately and intuitively set the channel width to match the width of the new material roll, making the entire process simple and quick. The baffles are designed with specific angles at both ends to facilitate the smooth introduction of the packaging material into the channel. The precisely adjustable limiting channel fundamentally prevents problems such as misalignment, wrinkles, or edge wear caused by the mismatch between the packaging material width and the channel, ensuring the alignment and stability of the material during folding within the buffer bin 21 and during subsequent conveying.

[0054] Roller assemblies are distributed throughout the device, primarily including rollers 271 (position 1), 272 (position 272), 273 (position 3), 274 (position 4), 275 (position 5), 276 (position 6), 277 (position 7), 278 (position 8), 279 (inner chamber), 2710 (sensor position roller 1), and 2711 (sensor position roller 2). These rollers are strategically arranged within the buffer chamber 21 and along external paths. This arrangement is designed to collectively create a continuous and smooth packaging material conveying path that begins at the entrance of the buffer chamber 21, meanders within the chamber, and exits at its outlet. This path fully utilizes vertical space and minimizes horizontal space occupation.

[0055] The roller assembly includes two key positioning rollers: the inner roller 279 located inside the buffer bin 21, and the fifth roller 275 located at the outlet of the buffer bin 21. The inner roller 279 is horizontally suspended below the internal inlet of the U-shaped buffer bin 21. Its core function is to limit the swaying amplitude of the packaging material as it is pushed into the buffer bin by the motor-driven pressure roller assembly 23. Without this limiter, the soft packaging material may wobble significantly during high-speed buffering, causing trajectory deviation, interference with the bin body, or wrinkles and creases during stacking, affecting subsequent conveying and product quality. The fifth roller 275 is positioned at the outlet of the buffer bin 21, opposite the pressure roller 284 in the outlet retainer assembly 28, together forming the final output channel for the packaging material leaving the buffer bin 21. These two rollers are not isolated but rather two crucial nodes connecting the preceding and following stages in the complete, meandering packaging material conveying path constructed by the roller assembly.

[0056] When the motor-driven pressure roller assembly 23 pushes the packaging material into the buffer bin 21, the inner roller 279 provides a flexible upper limit stop on the naturally drooping upper arc of the packaging material, effectively limiting its left-right and up-down swaying amplitude. This ensures that the packaging material falls into the bottom of the bin for stacking along a stable and centered trajectory, thereby preventing stacking chaos, creases, or collisions with the bin walls caused by excessive swaying. See [link to relevant documentation]. Figure 1 In the buffered state, the packaging material falls directly to the bottom of the storage compartment in an arched, suspended shape. At this time, the packaging material is in a relaxed stacked state. See [link to relevant documentation]. Figure 10 .

[0057] The fifth roller 275, located at the outlet of the buffer bin 21, is a crucial turning point where the packaging material exits its buffered state and is re-extracted. After the packaging material completes its folding and buffering within the buffer bin 21, its front end (or the remaining tail end after consumption) needs to be redirected to the path leading to the main unit 4 of the aluminum-plastic machine. The fifth roller 275 works in conjunction with the adjacent pressure roller 284, forming a roller gap with a slight clamping or tight guiding effect. This roller gap ensures that the packaging material is smoothly and centrally pulled out from the loosely folded state of the buffer bin 21, preventing the multi-layered material from becoming entangled or misaligned at the outlet. The accurate positioning of the fifth roller 275 ensures the stability of the packaging material's exit direction, laying the foundation for the subsequent complex path formed by the sixth roller 276, the seventh roller 277, and so on.

[0058] From the working process, during normal operation, the packaging material enters the buffer bin 21 from the rotating roller 236, naturally droops through the space below the inner shaft roller 279, and is then guided to the outlet of the buffer bin 21. At the outlet, the packaging material passes through the roller gap between the fifth shaft roller 275 and the pressure roller 284, its movement precisely centered and guided to the subsequent path. In buffer mode, the packaging material enters the buffer bin 21 from the rotating roller 236, and is stacked vertically in an arched shape at the bottom of the bin (without contacting the inner shaft roller 279), forming a multi-layered folded buffer reserve. At this time, the fifth shaft roller 275 guides the front end of the packaging material (or the newly entered section) into the buffer area, ensuring its stable posture. When the buffer material needs to be consumed, the traction force of the aluminum-plastic machine host 4 is transmitted through the packaging material, causing the stacked packaging material to pass around the inner shaft roller 279 sequentially from the top layer, and then be guided to the outlet of the buffer bin 21. At the outlet, the packaging material passes through the roller gap between the fifth shaft roller 275 and the pressure roller 284, its movement precisely guided. The collaborative design of the in-warehouse roller 279 and the fifth-position roller 275 dynamically participates in the packaging material path. During the buffering stage, the packaging material does not contact the in-warehouse roller 279, making full use of the vertical space of the U-shaped warehouse for large-capacity stacking without the need to reserve extra clearance space for the rollers. During the output stage, the in-warehouse roller 279 and the fifth-position roller 275 work together to ensure a smooth transition of the packaging material from "loose stacking" to "directional conveying", avoiding wrinkles, deviation, or jamming.

[0059] Furthermore, sensor positioning roller 1 2710 and sensor positioning roller 2711 are a set of guide rollers with special functions in the roller assembly, designed to be "relatively positioned". Typically, they are installed parallel to each other near the splicing platform 41 and fixed to the support column of the splicing platform 41 by the second connecting plate 46, maintaining a precise gap slightly larger than the thickness of the packaging material, thus forming a narrow, constant-sized channel between them specifically for the packaging material to pass through. The detection probe of the shortage sensor (its installation position corresponds to the shortage sensor sensing position 44) is precisely aligned with this channel, so that its detection area (i.e., the shortage sensor detection area 45) completely covers and confines the channel space. The design concept of this structure aims to solve a key problem: how to ensure the stable and reliable detection signal of the non-contact shortage sensor (such as photoelectric or ultrasonic sensor) during high-speed dynamic operation, unaffected by packaging material shaking, drifting, or surface wrinkles. If packaging materials are allowed to pass freely through an open space for inspection, even minor changes in their position and orientation can easily cause false sensor triggering, resulting in false alarms or missed detections. By setting up sensor positioning rollers 1 (2710) and 2 (2711), the position and orientation of all packaging materials entering the inspection area are forcibly corrected and stabilized as they pass through the channel. These two rollers eliminate most of the lateral sway and longitudinal fluctuations of the packaging materials, forcing them to pass through the core inspection point in a straight and centered state.

[0060] During operation, whether the packaging material flows out of the buffer bin 21 during normal production or when new packaging material is consumed after a roll change, the packaging material must pass through the channel between sensor positioning roller 1 2710 and sensor positioning roller 2711. When the packaging material is present and passes through normally, it continuously blocks (or reflects) the sensor's detection beam, and the sensor outputs a "material present" signal to the electronic control system 3. Once the old roll is exhausted, this channel will become empty instantly before splicing is completed, the sensor state will change immediately, and the electronic control system 3 will receive a "material shortage" signal. Due to the constraint of the channel, even if the packaging material vibrates slightly on its path before arrival due to high-speed conveying, it will be in a stable and predictable state the instant it passes through the detection area. This ensures the detection timing of state changes, avoids response delays, fundamentally avoids unnecessary equipment deceleration or shutdown due to false alarms, and also prevents material shortage production accidents that may be caused by missed alarms. The second connecting plate 46 provides a stable mounting base, preventing the sensor positioning roller itself from shifting due to vibration, and ensuring the long-term stability of the detection channel geometry.

[0061] like Figure 9As shown, the outlet baffle assembly 28 is fixed to the upper right side of the main back plate 22, that is, the outlet position outside the buffer compartment 21. This assembly mainly includes a support plate 281, a connecting square tube 282, a pair of stainless steel baffles 283, a pressure roller 284, a connecting block 285, a first connecting plate 286, a rotating shaft 287, and an adjusting handle 288.

[0062] Its core function is to provide secondary guidance and constraint for PVC / PVDC packaging materials leaving the buffer compartment at bends, preventing them from deviating. The support plate 281 is fixed to the main back plate 22 with screws, providing the mounting base for the entire assembly. The connecting square tube 282 is threaded to the support plate 281 and has an elongated slot. A pair of stainless steel baffles 283 are connected to the connecting square tube 282 via an adjusting handle 288. Rotating the adjusting handle 288 drives the baffles 283 to move along the elongated slot on the connecting square tube 282, thereby quickly adjusting the width between the two baffles 283 to accommodate different packaging material specifications. Each baffle 283 has an integrally formed semi-circular cover plate on its upper part, which, together with the pressure roller 284, forms an arc-shaped constraint channel above the packaging material, ensuring that the packaging material passes smoothly within a certain range during operation, avoiding jumping or drifting caused by high-speed conveying; the annular baffles on both sides of the baffle 283 precisely limit the left and right movement of the packaging material. The pressure roller 284 is mounted on the baffle body 283 via a rotating shaft 287 and a connecting block 285, allowing it to rotate freely. Its function is to work in conjunction with the fifth-position shaft roller 275 to apply slight auxiliary pressure to the passing packaging material, enabling it to better adhere to the guide arc and enhance conveying stability. The first connecting plate 286 is used to reinforce the structure.

[0063] In actual operation, without this outlet retaining component, the packaging material may experience occasional bulging or serpentine deviation due to uneven tension and inertia after prolonged operation, affecting the accuracy of subsequent entry into the main unit 4. This component effectively eliminates such unstable factors through adjustable-width mechanical limiting and arc-shaped pressure guidance. A bottom support 24 is provided in the lower space of the buffer compartment 21 to provide some support for the PVC / PVDC.

[0064] In some embodiments, the buffer device 2 further includes a removable door 25 detachably mounted on the front of the buffer compartment 21. The removable door 25 has a top protrusion 251 and a side protrusion 252. The top protrusion 251 has a mounting hole for hanging on an adjusting screw on the buffer compartment 21, and the side protrusion 252 is engaged in a slot on the support beam 29. This structure facilitates operation. The removable door 25 is a separate panel specifically designed for the buffer compartment 21, and its function is to close the front opening of the buffer compartment 21. Since the buffer compartment 21 is an area where packaging materials are frequently folded and passed through, occasional packaging material breakage or cleaning may occur. The "removable" design of the removable door 25 allows operators to quickly open a wide working window without disassembling the entire buffer device 2 or using complex tools, directly cleaning the interior of the buffer compartment 21, threading packaging materials, or performing simple maintenance, greatly reducing equipment downtime and operational difficulty.

[0065] The electrical control system 3, acting as the brain of the device, works closely with the mechanical components. It mainly comprises the electrical control cabinet assembly 31, the operation box assembly 32, and the fault indicator light 33. Both the operation box assembly 32 and the fault indicator light 33 are fixed to the main frame 1. The electrical control system 3 establishes a signal connection with the motor-driven pressure roller assembly 23, receiving instructions and sending control commands to it, thereby precisely directing a series of actions such as pressing, separating, rotating, and stopping the drive roller 237 and the rotating roller 236. The operation box assembly 32 is typically installed on the main frame 1 in a convenient location for personnel operation. Its panel features control buttons for controlling the internal control logic of the electrical control system 3. Through the coordination of the electrical control system 3, the entire roll changing process can be transformed from manual, experience-based operation into a repeatable, controllable automated or semi-automated process. The fault indicator light 33, based on system self-diagnostic results, visually displays the device's operating status through different colors or flashing patterns, such as normal operation, alarm, or fault, providing operators with additional status monitoring information and further enhancing operational reliability and safety.

[0066] In one embodiment, the electronic control system 3 also includes a material shortage sensor. The material shortage sensor is located on the packaging material conveying path downstream of the buffer bin 21 and is electrically connected to the electronic control system 3. Specifically, its detection area (i.e., the material shortage sensor detection area 45) is aligned with the final conveying section after the packaging material leaves the buffer bin 21 and before entering the main machine 4 of the aluminum-plastic machine. The installation position of this sensor is crucial, as it directly monitors the real-time status of the "online" packaging material that will be consumed by the main machine, ensuring the timeliness and accuracy of the detection signal. The material shortage sensor establishes an electrical connection with the electronic control system 3 via a cable, converting the physical signal it senses into an electrical signal in real time and transmitting it to the electronic control cabinet assembly 31 of the electronic control system 3 for processing. From the perspective of operation, the material shortage sensor is integrated with the winding roller path. After exiting the buffer bin 21, the packaging material is conveyed along a path consisting of rollers 276 (position 6), 277 (position 7), and 278 (position 8), and must pass through a specific channel formed by sensor rollers 2710 and 2711 positioned opposite each other. This channel is located precisely within the material shortage sensor detection area 45. The function of sensor rollers 2710 and 2711 is to accurately guide and position the packaging material, ensuring it passes the detection point with a stable posture and position. This eliminates interference from packaging material vibration or deviation on detection accuracy, making the detection results of the material shortage sensor more reliable.

[0067] During operation, when the aluminum-plastic composite machine needs to replace with new PVC or PVDC rolls, the machine does not need to be stopped. The lead of the new roll is introduced into the device and driven into the buffer bin 21 by the motor-driven pressure roller assembly 23. Due to the U-shaped structure and specific internal roller layout of the buffer bin 21, the packaging material will naturally fold and accumulate within the bin under the influence of gravity and guidance, achieving buffering. At the same time, the main unit 4 of the aluminum-plastic composite machine continues to consume the existing packaging material that is still being stably output from the outlet of the buffer bin 21 through the winding path of the roller assembly. The electrical control system 3, by controlling the feed speed of the motor-driven pressure roller assembly 23, can ensure the length of packaging material accumulated in the buffer bin 21, thus providing the operator with sufficient time to splice the old and new packaging materials at the splicing platform 41. After splicing is completed, the device resumes normal conveying. The entire technical solution achieves efficient vertical space utilization and large-scale buffering through the U-shaped buffer bin 21, ensures the packaging material is aligned and does not deviate through the adjustable-width baffle limit component 26, and ensures smooth material conveying and stable tension through the winding shaft roller path. Ultimately, it achieves the technical effect of truly non-stop roll changing of the aluminum-plastic machine within a very limited horizontal floor area, significantly improving the overall production efficiency and automation level of the equipment.

[0068] Specifically, when the main unit 4 of the aluminum-plastic machine is running normally, the PVC / PVDC packaging material is located at position 42 of the PVC / PVDC packaging material clamping position. The PVC / PVDC packaging material passes through the splicing platform 41, passes the first roller 271, and moves from the top to the second roller 272, along the bottom support 24 to the third roller 273, then passes the fourth roller 274, and finally to the rotating roller 236. At this time, the PVC / PVDC enters the buffer chamber 21, and from the bottom of the roller 279 in the buffer chamber 21, it passes through the baffle limiting component 26 to the outlet position of the buffer chamber 21. Between roller 275 (position 5) and pressure roller 284, the PVC / PVDC material moves downwards, passing through the outer side of roller 276 (position 6) and the inner side of roller 277 (position 7), reaching the outer side of roller 278 (position 8). At this point, the PVC / PVDC packaging material passes through the material shortage sensor sensing area 45, passing inside the sensor rollers 2710 and 2711, and finally reaches the packaging material inlet of the aluminum-plastic machine main unit 4, entering the machine's interior. Sensor rollers 2710 and 2711 are fixed to the support columns of the splicing platform 41 via the second connecting plate 46. Both the PVC / PVDC packaging material entering and exiting the hopper pass through the material shortage sensor sensing area 45.

[0069] Specifically, when a roll change is required, the PVC / PVDC packaging material is positioned at PVC / PVDC packaging material holder 43. The operator manually controls the drive roller 237 to rotate and press down by triggering a button on the operation box assembly 32. At this time, the PVC / PVDC packaging material begins to be collected and buffered inside the buffer bin 21. The aluminum-plastic composite machine host 4 operates normally, driving the PVC / PVDC to advance normally. When the PVC / PVDC inside the buffer bin 21 reaches a certain length, the operator manually controls the drive roller 237 to stop rotating and lift by triggering a button on the operation box assembly 32. The operator can then perform non-stop splicing of the PVC / PVDC at the splicing platform 41, achieving roll change without stopping the aluminum-plastic composite machine.

[0070] The above embodiments are merely illustrative examples and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A non-stop roll changing device for an aluminum-plastic composite machine, characterized in that, include: Main frame (1), buffer device (2) and electronic control system (3); The buffer device (2) and the electronic control system (3) are mounted on the main frame (1); The buffer device (2) includes a U-shaped buffer chamber (21), a motor pressure roller assembly (23), a baffle limiting assembly (26), an outlet material blocking assembly (28), and a shaft roller assembly; The buffer bin (21) has an inlet and an outlet; the motor pressure roller assembly (23) is located at the inlet of the buffer bin (21) and includes a drive roller (237) and a rotating roller (236) that can move relative to each other to press or separate; the baffle limiting assembly (26) is located at the outlet of the buffer bin (21) and includes a pair of stainless steel baffles (261) with adjustable width; the outlet retaining assembly (28) is located at the external outlet of the buffer bin (21) and includes a pair of stainless steel retaining bodies (283) with adjustable width; a plurality of rollers of the roller assembly are arranged inside and outside the buffer bin (21) to form a packaging material conveying path that meanders from the inlet to the outlet; The electrical control system (3) is connected to the motor roller assembly (23) via signal connection.

2. The apparatus according to claim 1, characterized in that, The electronic control system (3) includes an operation box assembly (32); the operation box assembly (32) is provided with a control button, which is configured to send a control signal to the motor roller assembly (23) in response to user operation.

3. The apparatus according to claim 1, characterized in that, The electronic control system (3) also includes a material shortage sensor; the material shortage sensor is located on the packaging material conveying path downstream of the buffer bin (21) and is electrically connected to the electronic control system (3).

4. The apparatus according to claim 1, characterized in that, The electronic control system (3) also includes a limit sensor (210); the limit sensor (210) is fixed to one side of the buffer compartment (21) by a sensor mounting bracket (2101), and the other side of the buffer compartment (21) is fixed with a reflector (2102) that is paired with the limit sensor (210) by a reflector mounting plate (2103).

5. The apparatus according to claim 1, characterized in that, The motor roller assembly (23) also includes a servo motor (231) and a cylinder (238). The servo motor (231) is connected to the drive roller (237) in a transmission connection; the drive roller (237) is rotatably mounted on a movable support plate (234); the rotating roller (236) is fixedly mounted on a fixed support plate (235); the telescopic rod of the cylinder (238) is connected to the movable support plate (234) to drive the movable support plate (234) and the drive roller (237) to swing, thereby causing the drive roller (237) to press against or move away from the rotating roller (236).

6. The apparatus according to claim 5, characterized in that, The servo motor (231) is connected to the drive roller (237) via a reducer (232), pulley (239) and belt (2310) to form a belt drive connection.

7. The apparatus according to claim 1, characterized in that, The outlet baffle assembly (28) also includes a support plate (281), a connecting square tube (282), a baffle body (283), a pressure roller (284), a connecting block (285), a connecting plate (286), a rotating shaft (287), and an adjusting handle (288). The pair of stainless steel baffles (283) are threadedly connected to the connecting square tube (282); the connecting square tube (282) is threadedly connected to the support plate (281); the outlet baffle assembly (28) is fixed on the buffer device (2) through the support plate (281); the adjusting handle (288) can drive the stainless steel baffles (283) to move along the width direction of the packaging material.

8. The apparatus according to claim 1, characterized in that, The baffle limiting assembly (26) further includes a lead screw, a handwheel, and a digital position display (267); the pair of stainless steel baffles (261) are respectively threaded to the lead screw; the handwheel is connected to one end of the lead screw; rotating the handwheel can drive the stainless steel baffles (261) to move along the width direction of the packaging material; the digital position display (267) is used to display the position of the stainless steel baffles (261).

9. The apparatus according to claim 3, characterized in that, The roller assembly includes an in-cell roller (279) disposed inside the buffer compartment (21), a fifth-position roller (275) disposed at the outlet of the buffer compartment (21), and a sensor-position roller one (2710) and a sensor-position roller two (2711); the sensor-position roller one (2710) and the sensor-position roller two (2711) are disposed opposite to each other to form a channel for the packaging material to pass through, and the detection area of ​​the material shortage sensor corresponds to the channel.

10. The apparatus according to claim 1, characterized in that, The main frame (1) is provided with an openable protective door; the buffer device (2) also includes a detachable door (25) that is detachably installed at the front of the buffer compartment (21).

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